論文 - 内貴　章世

西表島における外来植物アメリカハマグルマ（キク科）の分布状況

内貴　章世, 山本　武能, 井村　信弥, 渡辺　信

沖縄生物学会誌 ( 沖縄生物学会 )  64   91 - 99   2026年03月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Chromosome Numbers of Two Japanese Antrophyum, A. obovatum and A. formosanum (Pteridaceae, Polypodiales)

Tao Fujiwara, Katsuhiro Yoneoka, Takenori Yamamoto, Akiyo Naiki

The Journal of Japanese Botany   101 ( 1 )   2026年02月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

Cytological observation was conducted for the first time on Japanese Antrophyum (Pteridaceae), namely A. obovatum and A. formosanum. The chromosome numbers of the two species were counted as 2n = 240 for the former and 2n = ca. 240 for the latter. Considering the basic chromosome number is x = 30, they are considered as octoploid species. The chromosome numbers, 2n = 240, are first reported for them. Our study demonstrated the pervasiveness of polyploidy in the genus.

Phylogenetic Relationships of Eurya (Pentaphylacaceae) with a Focus on Japanese Species

Tetsuo OHI-TOMA, Emiko OGURI, Harue ABE, Hidetoshi KATO, Masaharu AMANO, Mong-Huai SU, Hanghui KONG, Hidetoshi NAGAMASU, Akiyo NAIKI

The Journal of Japanese Botany   100 ( 5 ) 373 - 384   2025年10月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

キバナハマヒルガオ（ヒルガオ科）を西表島，石垣島，宮古島に記録する

内貴 章世, 和智 仲是, 森脇 大樹, 中西 弘樹

植物地理・分類研究 ( 日本植物分類学会 )  73 ( 1 ) 89 - 91   2025年05月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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外来植物アメリカスズメウリ（ウリ科）を 西表島に記録する

内貴　章世

沖縄生物学会誌 ( 沖縄生物学会 )  63   89 - 92   2025年03月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

西表島北部の農道脇において，アメリカ北東部～南部および中南米原産の外来植物，アメリカスズメウリMelothria pendula L．の生育が確認された．本種は他の植物を覆い，その成長を阻害する可能性があるため，島内での分布や今後の動態を注視する必要がある．

Two new species and one new addition of Lasianthus (Rubiaceae) for the flora of Vietnam

VAN-SON DANG, TUAN ANH LE, THANH SON HOANG, VAN SON LE, VAN BAC HA, QUOC TRONG PHAM, SOULADETH PHETLASY, SHUICHIRO TAGANE, AKIYO NAIKI

Phytotaxa     2025年03月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Double migration of the endangered Tricyrtis formosana (Liliaceae) in Japan.

Tsunenari K, Ito T, Yokota M, Shibabayashi M, Endo C, Chung KF, Suyama Y, Matsuo A, Abe A, Naiki A, Setoguchi H, Makino T, Isagi Y

Scientific reports ( Scientific Reports )  14 ( 1 ) 957 - 957   2024年01月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

The Ryukyu Islands of Japan are a biodiversity hotspot due to geographical and historical factors. Tricyrtis formosana is a perennial herbaceous plant that commonly found in Taiwan. But only a few populations have been identified in a limited habitat on Iriomote Island, while populations of unknown origin occur near human settlements in an area on the main island of Okinawa. To better understand these populations of the phylogenetic uniqueness and intrinsic vulnerability, we conducted comparative analyses including (1) phylogeny and population structure with MIG-seq data, (2) photosynthesis-related traits of plants grown under common conditions and (3) transcriptome analysis to detect deleterious variations. Results revealed that T. formosana was split into two clades by the congeners and that Iriomote and Okinawa populations independently derived from ancestral Taiwanese populations in each clade. Photosynthetic efficiency was lowest in the Iriomote population, followed by Okinawa and Taiwan. Transcriptome analysis showed that the Iriomote population accumulated more deleterious variations, suggesting intrinsic vulnerability. These results indicate that each T. formosana population in Japan is phylogenetically unique and has been independently dispersed from Taiwan, and that the Iriomote population presents a high conservation difficulty with a unique photosynthesis-related characteristic and a larger amount of deleterious variations.

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沖縄県西表島産希少植物の島内分布調査と記録の確認 : 維管束植物相解明に向けて

山本 武能, 米倉 浩司, 阿部 篤志, 天野 正晴, 遠山 弘法, 設樂 拓人, 田金 秀一郎, 長谷川 文, 加島 幹男, 梶田 忠, 副島 顕子, 内貴 章世

植物研究雑誌 = The journal of Japanese botany / 植物研究雑誌編集委員会 編 ( ツムラ )  98 ( 4 ) 178 - 191   2023年08月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Hymenophyllum pilosissimum C. Chr. (Hymenophyllaceae) on Iriomote Island, a New Record for Japan

Akiyo Naiki, Takenori Yamamoto, Aya Hasegawa, Tao Fujiwara, Katsuhiro Yoneoka, Atsushi Ebihara

Acta Phytotaxonomica et Geobotanica ( 日本植物分類学会 )  74 ( 2 ) 131 - 133   2023年07月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

Hymenophyllum pilosissimum C. Chr. (Hymenophyllaceae), recently discovered on Iriomote Island, is reported for the first time in Japan.

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Rediscovery of Exallage auricularia (Rubiaceae) from Yonaguni Island, Okinawa, Japan

Akiyo Naiki, Tadaki Nakasone, Tetsuo Ohi-Toma, Koji Yonekura, Atsushi Abe

The journal of Japanese botany   98 ( 3 ) 134 - 139   2023年06月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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西表島から日本新産外来植物シマミゾハコベ（アカネ科）の報告

梶田 結衣, 米倉 浩司, 内貴 章世

植物研究雑誌 ( 植物研究雑誌編集委員会 )  98 ( 2 ) 97 - 100   2023年04月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

<p>アカネ科の外来植物シマミゾハコベ <i>Dentella repens</i> (L.) J.R.Forst. & G.Forst. が2020 年に沖縄県西表島から初めて発見された．本種および <i>Dentella</i>属の記録は国内で初めてである．2020年より現在に至るまで，島内北部の海岸部の集落1カ所で，毎年安定的に生育し，開花・結実していることが確認された．植物の形態は実体顕微鏡で観察し，形態の詳細を記載した．本研究による観察結果は，先行研究における本種の特徴とおおむね一致した．花冠裂片と萼の上部の毛の形状は本種において新たに追加される特徴である．</p>

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チトセカズラ（マチン科）のレクトタイプ選定

大井・東馬 哲雄, 田中 伸幸, 内貴 章世

植物研究雑誌 ( 植物研究雑誌編集委員会 )  98 ( 2 ) 77 - 81   2023年04月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

チトセカズラGardneria multiflora Makino（マチン科Loganiaceae）の4 点のシンタイプのうち，吉野善介が備中（現岡山県高梁市）で採集して牧野富太郎に送付した標本は行方不明であり，東京帝国大学理科大学附属植物園で栽培されていた株から採集された3 点の標本のうち，花の付いた標本 (MAK96478) をレクトタイプとして選定した．なお，学名発表後に吉野が備中で採集した標本に関しても付記した．

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ココヤシCocos nucifera(ヤシ科)の野生個体を西表島に記録する

大越 光太郎, 天野 正晴, 山本 武能, 内貴 章世, 齊藤 由紀子

沖縄生物学会誌 ( 沖縄生物学会 )  61   69 - 72   2023年03月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

A revision of the genus Lasianthus Jack (Rubiaceae) from Vietnam

Van-Son Dang, Akiyo Naiki

Phytotaxa   581 ( 1 ) 1 - 150   2023年01月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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The contrary conservation situations of two local critically endangered species, Vaccinium emarginatum (Ericaceae) and Elatostema platyphyllum (Urticaceae), growing on the eastern edge of the distribution

Mayu Shibabayashi, Taiga Shimizu, Chinatsu Tokuhiro, Yoshihisa Suyama, Shota Sakaguchi, Takuro Ito, Chih-Chieh Yu, Kuo-Fang Chung, Jun’ichi Nagasawa, Toshiaki Shiuchi, Goro Kokubugata, Atsushi Abe, Akiyo Naiki, Atsushi J. Nagano, Yuji Isagi

Frontiers in Ecology and Evolution ( Frontiers Media SA )  11   2023年01月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

As biodiversity loss continues, there is an urgent need to develop efficient conservation measures to protect diversity with limited conservation resources. Conservation targets have generally been selected based on their population size, but more detailed assessments clarifying the phylogenetic genetic status, history, and phylogenetic uniqueness of rare species is crucial to set more appropriate and effective conservation measures. In Japan, the Act on Conservation of Endangered Species of Wild Fauna and Flora designated endangered plants with high conservation priority, but &amp;gt;40% of these species also grow overseas. We conducted comparative analyses based on ddRADseq and MIG-seq to evaluate the population conservation status and value of Vaccinium emarginatum and Elatostema platyphyllum which are growing across national borders at the eastern edge of their species distribution range. The analyses revealed contrasting conservation status between the two species; the Japanese population of V. emarginatum had lower genetic diversity at the individual level and phylogenetically differentiated from Taiwanese populations, while that of E. platyphyllum had higher diversity at the individual level and is a relatively recent migrant with little phylogenetical differentiation from Taiwanese populations. The two species, which share the common feature of being critically rare in Japan, showed contrasting genetic/phylogenetic characteristics. This study provided useful information for appropriate conservation measures based on species’ phylogenetic traits and genetic diversity.

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Two new species of genus Helicteres (Helicteroideae, Malvaceae) from Vietnam

Dang, V.-S, B.-V. Truong, N.-S. Hoang, V.-T. Nguyen, Q.-B. Nguyen, Q.-T. Pham, V.-T. Le, C.-N. Kieu, V.-H. Bui, A. Naiki

Academia Journal of Biology   44 ( 4 ) 123 - 132   2022年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Lasianthus gialaiensis (Rubiaceae), a New Species from the Gia Lai Plateau of Vietnam

Dang Van-Son, Truong Ba-Vuong, Hoang Nghia-Son, Le Van-Tho, Dang Minh-Quan, Nguyen Manh-Ha, Naiki Akiyo

Acta Phytotaxonomica et Geobotanica ( 日本植物分類学会 )  73 ( 3 ) 205 - 209   2022年11月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

Lasianthus gialaiensis V. S. Dang, Vuong, Quan & Naiki, a new species from Kon Chu Rang Nature Reserve, Gia Lai Province, in the central highlands of Vietnam, is described and illustrated. It is morphologically similar to L. bokorensis , which was discovered in Bokor National Park, southern Cambodia, in the shape of the leaves, inflorescences and orange fruit, but differs in having shorter petioles, shorter stipules and calyx tubes, larger corolla, and green calyx. A vernacular name, ecological information and a table comparing it with L. bokorensis are also provided.

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A New Locality for Elatostema lineolatum Wight var. majus Wedd. (Urticaceae) from Iriomote Island, Japan

Naiki Akiyo, Amano Masaharu, Yonekura Koji, Okoshi Kotaro, Saito Yukiko, Yamamoto Takenori, Shitara Takuto, Abe Atsushi

Acta Phytotaxonomica et Geobotanica ( 日本植物分類学会 )  73 ( 3 ) 219 - 226   2022年11月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

<i>Elatostema lineolatum </i>Wight var. <i>majus </i>Wedd. (Urticaceae) was recently found on Iriomote Island, Okinawa, Japan. Morphological and cytological observations and DNA barcoding based on nucleotide sequences of chloroplast <i>psbA-trnH </i>and nuclear ribosomal internal transcribed spacer (ITS) regions were used to compare it with <i>E. lineolatum </i>var. majus in Taiwan.

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Genomic insights into rapid speciation within the world's largest tree genus Syzygium.

Low YW, Rajaraman S, Tomlin CM, Ahmad JA, Ardi WH, Armstrong K, Athen P, Berhaman A, Bone RE, Cheek M, Cho NRW, Choo LM, Cowie ID, Crayn D, Fleck SJ, Ford AJ, Forster PI, Girmansyah D, Goyder DJ, Gray B, Heatubun CD, Ibrahim A, Ibrahim B, Jayasinghe HD, Kalat MA, Kathriarachchi HS, Kintamani E, Koh SL, Lai JTK, Lee SML, Leong PKF, Lim WH, Lum SKY, Mahyuni R, McDonald WJF, Metali F, Mustaqim WA, Naiki A, Ngo KM, Niissalo M, Ranasinghe S, Repin R, Rustiami H, Simbiak VI, Sukri RS, Sunarti S, Trethowan LA, Trias-Blasi A, Vasconcelos TNC, Wanma JF, Widodo P, Wijesundara DSA, Worboys S, Yap JW, Yong KT, Khew GSW, Salojärvi J, Michael TP, Middleton DJ, Burslem DFRP, Lindqvist C, Lucas EJ, Albert VA

Nature communications ( Nature Communications )  13 ( 1 ) 5031   2022年09月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

The relative importance of the mechanisms underlying species radiation remains unclear. Here, the authors combine reference genome assembly and population genetics analyses to show that neutral forces have contributed to the radiation of the most species-rich tree genus Syzygium.Species radiations, despite immense phenotypic variation, can be difficult to resolve phylogenetically when genetic change poorly matches the rapidity of diversification. Genomic potential furnished by palaeopolyploidy, and relative roles for adaptation, random drift and hybridisation in the apportionment of genetic variation, remain poorly understood factors. Here, we study these aspects in a model radiation, Syzygium, the most species-rich tree genus worldwide. Genomes of 182 distinct species and 58 unidentified taxa are compared against a chromosome-level reference genome of the sea apple, Syzygium grande. We show that while Syzygium shares an ancient genome doubling event with other Myrtales, little evidence exists for recent polyploidy events. Phylogenomics confirms that Syzygium originated in Australia-New Guinea and diversified in multiple migrations, eastward to the Pacific and westward to India and Africa, in bursts of speciation visible as poorly resolved branches on phylogenies. Furthermore, some sublineages demonstrate genomic clines that recapitulate cladogenetic events, suggesting that stepwise geographic speciation, a neutral process, has been important in Syzygium diversification.

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沖縄県西表島における外来植物目録

梶田 結衣, 米倉 浩司, 遠山 弘法, 赤井 賢成, 天野 正晴, 阿部 篤志, 山本 武能, 設樂 拓人, 齊藤 由紀子, 横田 昌嗣, 内貴 章世

大阪市立自然史博物館研究報告 ( 大阪市立自然史博物館 )  76   125 - 141   2022年03月 [ 査読有り ]

掲載種別: 研究論文（大学，研究機関紀要）

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2016年4月から2020年12月にかけて行った野外調査，先行研究による報告，および標本庫所蔵の標本にもとづく沖縄県西表島の外来植物目録を提供する．57科248種が確認され，このうち 59種は西表島からの初報告となる． A provisional list of alien plants on Iriomote Island, Okinawa, Japan, is provided based on our field surveys from April 2016 to December 2020, previous reports, and herbaria specimens. In total, 248 alien plant species of 57 families were recorded. Among them, 59 species are the first records in Iriomote Island.

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西表島の維管束植物221種の繁殖フェノロジー：ルートセンサスによる3年間の記録

梶田 結衣, 遠山 弘法, 山本 武能, 内貴 章世

大阪市立自然史博物館研究報告 ( 大阪市立自然史博物館 )  76   97 - 124   2022年03月 [ 査読有り ]

掲載種別: 研究論文（大学，研究機関紀要）

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沖縄県西表島において，ルートセンサスによる維管束植物 221種の繁殖フェノロジーの観察を 2017年4月よりおおむね10日おきに3年間実施した．シダ植物14種における胞子嚢群，イヌビワ属 8種における果嚢，およびその他の種子植物 199種におけるつぼみ・花・若い果実・成熟果の有無に関して，観察結果に基づいた生物季節学的パターンを報告する． Reproductive phenology of 221 species of vascular plants on Iriomote Island, Okinawa, Japan, was observed by a route census approximately every ten days from April 2017 to April 2020. We provide phenological patters of the occurrence of sori for 14 fern species, syconia for eight Ficus species, flower buds, flowers in anthesis, and young and mature fruits for the other 199 seed plant species.

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Multiple origins of two Ochrosia (Apocynaceae) species endemic to the Bonin (Ogasawara) Islands.

Noda H, Nishimura A, Kato H, Naiki A, Xiao W, Martinez M, Marutani M, McConnell J, Takayama K

Molecular phylogenetics and evolution ( Molecular Phylogenetics and Evolution )  171   107455 - 107455   2022年03月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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The genus, Ochrosia, is widely distributed from the West Indian Ocean throughout tropical Asia to the Middle Southern Pacific region. Ochrosia comprises many island-endemic species, suggesting that long-distance dispersal and isolation after migration are key factors for clarifying the diversification process. However, the phylogeny and biogeography of endemic Ochrosia species have not been evaluated well due to the difficulty of adequate sampling from the entire distribution range of the genus. In this study, we focused on two Ochrosia species endemic to the Bonin (Ogasawara) Islands in the northwest Pacific. The Bonin Islands are of volcanic origins and consist of two islands groups, the Ogasawara and Volcano Islands groups, approximately 300 km apart. Ochrosia nakaiana is endemic to the Ogasawara Islands group, whereas O. hexandra is endemic to the Volcano Islands group. To elucidate the phylogenetic positions of these two endemic Ochrosia species, we conducted molecular phylogenetic studies with dating and biogeographic analyses including other Ochrosia species. The phylogenetic trees showed that the two endemic species had distinct origins; O. nakaiana was closely related to O. oppositifolia and O. iwasakiana, whereas O. hexandra was related to O. mariannensis. Based on the chloroplast DNA phylogeny, the genus, Ochrosia, divided into two major lineages 36.6 million years ago. Further, the two endemic species of the Bonin Islands were independently derived approximately 1-2 million years ago. Ochrosia nakaiana originated from the Southeast Asia, New Caledonia, or other Pacific Islands, while O. hexandra derived from O. mariannensis in Micronesia. We demonstrated different origins of the two endemic Ochrosia species on the Bonin Islands. This study provided an excellent example of the complex origins and speciation of flora in the oceanic islands.

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A new species of Lasianthus (Rubiaceae) from Kon Chu Rang Nature Reserve in central highlands of Vietnam

Dinh Hiep Nguyen, Minh Quan Dang, Ngan Thi Kim Le, Van Toan Em Quach, Van Ngot Pham, Van Tho Le, Ba Vuong Truong, Naiki Akiyo, Van-Son Dang

PHYTOTAXA ( MAGNOLIA PRESS )  541 ( 3 ) 291 - 296   2022年03月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Lasianthus kbangensis V.S.Dang, Vuong & Naiki, a new species belonging to Lasianthus sect. Nudiflorae of Rubiaceae from the Central Highlands of Vietnam, is described and illustrated. This new species is similar to L. oblongilobus H. Zhu, but differs in having larger leaves, longer petioles, smaller calyx (calyx lobes) and corolla, and the color of ripen fruits. A table comparing the new species to closely related species is provided.

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Comparisons among populations and individuals to evaluate pollen-pistil interaction as a mechanism of reproductive interference in Taraxacum

Hashimoto Keisuke, Yamamoto Akane, Kanaoka Masahiro M., Naiki Akiyo, Takakura Ko-Ichi, Nishida Sachiko

JOURNAL OF PLANT RESEARCH ( Journal of Plant Research )  135 ( 1 ) 29 - 40   2022年01月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Reproductive interference (RI), an interspecific mating interaction that reduces the fitness of at least one of the species involved, can lead to exclusive distributions in closely related species. A hypothesis previously proposed is that RI in plants may occur by ovule usurpation, in which pistils lack interspecific incompatibility and mistakenly accept heterospecific pollen, thereby losing an opportunity for conspecific pollen fertilization. However, few comparative studies have evaluated the consistency of the inferred mechanism within and among individuals and populations. We conducted hand-pollination experiments in six populations of three native Taraxacum species that suffered from different levels of RI from an alien congener, T. officinale, and compared pollen-pistil interactions among populations. We also investigated the interactions for eight individual T. japonicum plants whose response to heterospecific pollen deposition had been previously measured. Our results revealed that pollen tubes often penetrated native ovaries following heterospecific pollination in populations suffering from strong RI, whereas they seldom did in populations suffering from marginal RI. However, the relative frequency of the pollen tube penetration was not significantly related to the strength of alien RI. Not all pistils on an individual plant showed the same pollen receptivity following heterospecific pollination; rather, some accepted and some refused the pollen tubes. The relationship between pollen tube penetration following heterospecific pollination and the strength of the alien RI was also not significant among individuals. Our present results generally support the ovule usurpation hypothesis, but suggest that other factors, such as competition for pollinator services, variation in the effects of heterospecific pollen donors, and condition of the native inflorescences, might also affect the observed RI strength.

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Hydrangea marunoi (Hydrangeaceae), a new species from Osumi Peninsula, southern Japan

Tagane S., Fujii S., Hirota K., Naiki A., Yahara T.

PhytoKeys ( PhytoKeys )  211   33 - 44   2022年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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A Revision of Leptopetalum foetidum (Rubiaceae)

Akiyo Naiki, Tetsuo Ohi-Toma

The Journal of Japanese Botany   96 ( 6 ) 326 - 333   2021年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

The taxonomy of Dischidia ruscifolia (Apocynaceae, asclepiadoideae) and the description of a new species, dischidia argentii

Arshed M.J., Callado J. R., Tandang D., Naiki A., Agoo E. M., Rodda, M.

Taiwania ( NATL TAIWAN UNIV PRESS )  66 ( 4 ) 496 - 503   2021年11月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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We document the taxonomic history of Dischidia ruscifolia Decne ex Becc. After a critical study of the available original material and additional specimens an epitype is designated. We confirm that D. myrtillus is a synonym of Dischidia ruscifolia and the name is typified. Clarification of the identity of D. ruscifolia allowed the identification of a new species that is here published and illustrated as Dischidia argentii Arshed, J.R. Callado & Tandang. The new species differs largely in its floral morphology and particularly in its glabrous corolla throat, absent corolline corona, gynostegium outline, and pollinium shape.

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Phylogenetic Relationship of Tropical Asian Ardisia and Relatives (Primulaceae) Shows Non-monophyly of Recognized Genera and Subgenera

Julius A, J. S. Gutiérrez-Ortega, S. Sabran, S. Tagane, A. Naiki, D. Darnaedi, M. M. Aung, V. S. Dang, N. V. Ngoc, H. T. Bin, Y. Watano, T. M.A, Utteridge, T. Kajita

The Journal of Japanese Botany   96 ( 3 ) 149 - 165   2021年06月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Morphology, phenology, and chromosomal observations in Najas minor and Najas chinensis from iriomote island, Okinawa, Japan

Kajita Y., Toyama H., Akai K., Naiki A.

Acta Phytotaxonomica et Geobotanica ( 日本植物分類学会 )  72 ( 2 ) 167 - 177   2021年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Najas minor and N. chinensis are newly reported from southern Iriomote Island, which is the southern-most distribution for both species in Japan. The morphology, reproductive phenology, and chromosomal numbers were compared with reports from previous studies. Najas minor on Iriomote Island was larger, up to 120 cm long, had longer leaves (3 to 4 cm long), flowered and fruited year-round and had a new karyotype (2n = 24) for the species in Japan. Najas chinensis on Iriomote Island was within the reported range of morphological and chromosomal variation for the species, but flowering and fruiting were observed almost throughout the years of study. Phenological and morphological descriptions provide new insights into the life cycles and identification of N. minor and N. chinensis.

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外来のOldenlandia boscii (アカネ科)を 東京大学田無演習林に記録する

鶴田 燃海, 内貴 章世, 練 春蘭

植物地理・分類研究 ( 日本植物分類学会 )  69 ( 2 ) 211 - 214   2021年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Taxonomic studies on Zingiberaceae of Myanmar II: Curcuma stolonifera (Subgenus Ecomatae), a new species from the northwestern region

Tanaka N., Armstrong K., Aung M. M., Naiki A.

Brittonia ( SPRINGER )  72 ( 3 ) 268 - 272   2020年09月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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In the course of taxonomic studies on Zingiberaceae in Myanmar, a new species of Curcuma assignable to subgenus Ecomatae was discovered in Htamanthi Wildlife Sanctuary, Sagaing Region, northwestern Myanmar. It is described and illustrated here as Curcuma stolonifera. This new species differs from other species in subgenus Ecomatae Skornick. & Sida f. in having a combination of the following characters; long creeping rhizomes, an oblong-lanceolate lamina with reddish midrib, a small number of green bracts, a central inflorescence, pale whitish yellow flowers, and a short slightly L-shaped anther with a curved spur.

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Resurrection and emended description of Sciaphila major (Triuridaceae)

Kenji Suetsugu, Martin Dancak, Michal Hrones, Akiyo Naiki, Shuichiro Tagane, Tetsukazu Yahara

PHYTOTAXA ( MAGNOLIA PRESS )  459 ( 1 ) 25 - 38   2020年09月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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This paper presents a re-evaluation of the taxonomic identity of Sciaphila major described from Sarawak, Borneo, Malaysia which has been considered conspecific with S. secundiflora. We revealed that S. major is clearly distinguishable from S. secundiflora s.s. by the arrangement of flowers on rachis (spirally and subdensely arranged vs. secundly and laxly arranged), rachis length in a fully developed inflorescence [(2-)3-6(-7) cm vs. 6-19 cm], tepal length of male flowers (2-2.3 mm vs. 3-4 mm) and the number of perianth segments (more than 6 vs. 6). By spirally-arranged and white flowers, S. major is most similar to S. alba, but is distinguishable by plant height (15-25 cm vs. 25-35 cm in S. alba), rachis length in a fully developed inflorescence [(2-)3-6(-7) cm vs. 8-14 cm)], the number of flowers (usually less than 20 vs. usually more than 20), the arrangement of flowers on rachis (subdensely arranged vs. laxly arranged), the number of male perianth segments (usually more than 6 vs. usually 6) and the condition of floral disc (flat vs. bowl-shaped). We also provide an updated key to the species of Sciaphila distributed in Borneo.

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A new species of Lasianthus (Rubiaceae), L. konchurangensis, from the Central Highlands of Vietnam

Thi Dung Ha, Bui Hong Quang, The Bach Tran, Hai Van Do, Huong Nguyen Thi Thanh, Ha Bui Thu, Tagane Shuichiro, Oguri Emiko, Naiki Akiyo, Van-Son Dang

PHYTOTAXA ( Phytotaxa )  451 ( 2 ) 161 - 168   2020年07月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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A new species, Lasianthus konchurangensis V.S.Dang, T.B.Tran & T.D.Ha (sect. Lasianthus), is described and illustrated from Kon Chu Rang Nature Reserve, Gia Lai Province, the Central Highlands of Vietnam Lasianthus konchurangensis resembles L. foetidissimus but differs in having larger leaves, more secondary veins, larger calyx and purple corolla. Photographs, vernacular name, preliminary conservation assessment, and a table comparing L. konchurangensis with L. foetidissimus are provided.

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Significant loss of genetic diversity and accumulation of deleterious genetic variation in a critically endangered azalea species, Rhododendron boninense, growing on the Bonin Islands

Isagi Y., Makino T., Hamabata T., Cao P.-L., Narita S., Komaki Y., Kurita K., Naiki A., Kamenyama Y., Kondo T., Shibabayashi M.

Plant Species Biology   35 ( 3 ) 166 - 174   2020年07月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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© 2020 The Society for the Study of Species Biology Loss of genetic diversity increases the risk of extinction of a population through inbreeding depression. In addition, the number of deleterious genetic variations, which might accumulate in a small population through genetic drift, can also make the population vulnerable. Rhododendron boninense is a critically endangered azalea species, which grows on the Bonin Islands, a UNESCO World Heritage Site; its population size in the wild dropped to only a single individual. Although a governmental program for species conservation has been conducted, no successful natural regeneration or population growth was achieved. We hypothesized that the reduced genetic diversity and accumulated deleterious genetic variation might cause the vulnerability of the species, and conducted comparative genetic and genomic analyses between R. boninense and its congeners. Genetic analysis using microsatellite markers indicated that the genetic diversity of R. boninense was ultimately low; microsatellite loci of this species were all fixed, whereas the congeners maintain high allelic diversity. Based on comprehensive transcriptome analysis, the amount of deleterious variation of R. boninense was significantly greater than that of R. amanoi. Repeated generation transitions of the small population of R. boninense on the oceanic islands is likely to have resulted in low genetic diversity as well as more deleterious variations in the genome, and we speculated that the accumulated deleterious variation might result in vulnerability of R. boninense. This study indicates the possibility of evaluating the feasibility of effective conservation programs based on the genetic diversity and the amount of accumulated deleterious variation in the genome of critically endangered species.

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An Updated Phylogeny of Leptopetalum (Rubiaceae) and Taxonomic Treatment of Herbaceous Species in East Asia

Tetuo Ohi-Toma, Akiyo Naiki, Shiho Waddell, Hidetoshi Kato, Van-Son Dang, Jin Murata

The Journal of Japanese Botany   95 ( 3 ) 141 - 153   2020年06月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Two New Species of Lasianthus (Rubiaceae) from Northern Vietnam

Dang V.S.

Annales Botanici Fennici ( Annales Botanici Fennici )  57 ( 1-3 ) 49 - 54   2020年05月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Two new species of Lasianthus (Rubiaceae). L. thuyanae V.S. Dang & Naiki from Ba Vi National Park, Ha Noi City, northern Vietnam, and L. tamdaoensis V.S. Dang from Tam Dao National Park, Vinh Phuc Province, northern Vietnam. are described and illustrated. Lasianthus thuyanae is closely related to L. curtisii but differs from it by having larger stipules and corollas, and a differently coloured calyx. Lasianthus tamdaoensis resembles L..filipes and L. longipedunculatus but differs from them by having longer petioles and larger corolla lobes.

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New Localities of Seed Plants Recorded from the Subtropical Ryukyus of Japan at Island Level Based on Herbarium Data

國府方 吾郎, 海老原 淳, 齊藤 由紀子, 天野 正晴, 阿部 篤, 中村 剛, 内貴 章世, 梶田 忠, 横田 昌嗣

Bulletin of the National Museum of Nature and Science. Series B, Botany / National Museum of Nature and Science ( National Museum of Nature and Science )  46 ( 2 ) 75 - 87   2020年05月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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The effects of water pollution on the phylogenetic community structure of aquatic plants in the East Tiaoxi River, China

Toyama H., Bessyo K., Huang L. L., Hirota S. K., Kano Y., Mase K., Sato T., Naiki A., Li J. H., Shimatani Y., Yahara T.

Freshwater Biology   65 ( 4 ) 632 - 645   2020年04月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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© 2019 John Wiley & Sons Ltd Water pollution is one of the most serious aquatic environmental problems worldwide. In China, recent agricultural and industrial development has resulted in rapid changes in aquatic ecosystems. Here, we reveal the effects of water pollution on the phylogenetic community structure of aquatic macrophytes in the Tiaoxi River, China. We placed a rectangular plot at 47 sites within the Tiaoxi River from the mouth of the river to 88.5 km upstream, in which we recorded species abundance and measured 22 physico-chemical variables. Bayesian phylogeny using the rbcL and matK gene sequences was employed to quantify phylogenetic α- and β-diversity, and test the phylogenetic signal in four growth forms: emergent, floating-leaved, free-floating, and submerged. Within communities, water contamination and phytoplankton abundance decreased species richness and phylogenetic diversity, which resulted in phylogenetic clustering; species within communities were more closely related to each other than expected. Between communities, differences in geographical distance and phytoplankton abundance resulted in phylogenetic dissimilarity among plots. Aquatic macrophytes showed phylogenetic signals in which related species responded more similarly to disturbance. Thus, the observed patterns could be explained by environmental filtering and suggested that water pollution by human activity has added more filters to the existing environmental filters that drive the species assembly of macrophyte communities.

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Habitat partitioning in native Geranium species through reproductive interference.

Nishida S, Takakura KI, Naiki A, Nishida T

Annals of botany ( Annals of Botany )  125 ( 4 ) 651 - 661   2020年03月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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BACKGROUND AND AIMS: Heterospecific pollen transfer may reduce fitness of recipient species, a phenomenon known as reproductive interference. A theoretical study has predicted that distributions of species pairs affected by reproductive interference may be syntopic under negligible reproductive interference, sympatric but with partitioning at small spatial scale (i.e., allotopic) under weak interference, or exclusive, when reproductive interference is strong. Verifying these predictions is essential for evaluation of the applicability of reproductive interference as a general assembly rule of biological communities. The aim of this study was to test these predictions in two sympatrically distributed wild Geranium species, G.thunbergii and G. wilfordii. METHODS: To measure the effect of reproductive interference, the association between the relative abundance of the counterpart species and seed set in the focal species, and seed set reduction following the mixed pollination, were analysed. The possibility of hybridization with viable offspring was examined by genotyping plants in the field and after mixed pollination. Fertility of putative hybrids was based on their seed set and the proportion of pollen grains with apertural protrusions. A transect study was conducted to examine spatial partitioning, and possible influences of environmental conditions (canopy openness and soil moisture content) on partitioning between the species were analysed. KEY RESULTS: Neither abundance of the counterpart species nor heterospecific pollen deposition significantly affected seed set in the focal species, and hybridization between species was almost symmetric. Putative hybrids had low fertility. The two species were exclusively distributed at small scale, although environmental conditions were not significantly different between them. CONCLUSIONS: The allotopy of the two species may be maintained by relatively weak reproductive interference through bidirectional hybridization. Re-evaluation of hybridization may allow ongoing or past reproductive interference to be recognized and provide insight into the distributional relationships between the interacting plants.

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Contributions to the flora of Myanmar V: A new record of Mallotus tokiae (Euphorbiaceae) with the description of flower morphology from Lampi Island

Toyama H.

Thai Forest Bulletin (Botany) ( Thai Forest Bulletin (Botany) )  48 ( 1 ) 1 - 6   2020年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Comparison of mechanisms of reproductive interference in Taraxacum.

Takemori A, Naiki A, Takakura KI, Kanaoka MM, Nishida S

Annals of botany ( Annals of Botany )  123 ( 6 ) 1017 - 1027   2019年06月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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BACKGROUND AND AIMS: Reproductive interference may reduce fitness of either of the involved species, with potentially important ecological and evolutionary consequences. Except for the effect of shared pollinators on reproductive success, however, mechanisms underlying reproductive interference have been little studied, even though the severity of its impact may depend on the specific mechanism. The aim of this study was therefore to explore the mechanisms of reproductive interference between Taraxacum japonicum (native to Japan) and Taraxacum officinale (alien). METHODS: In a field survey, the association between alien species density and seed set in T. japonicum, and whether pollinator behaviour indicated a preference for the alien, were examined. Effects of heterospecific pollen deposition were measured in a series of hand pollination experiments, including mixed pollination experiments in which the order of application of conspecific and heterospecific pollen was varied. Finally, to investigate hybridization frequency, the parentage of seedlings produced following natural, mixed or heterospecific pollination was compared. KEY RESULTS: Alien species density did not negatively affect native seed set, nor did pollinators appear to have a preference for alien flowers. The hand pollination experiments showed that heterospecific pollen deposition adversely affected native seed set, especially when alien pollen was applied before conspecific pollen. No viable hybrids were found following natural pollination, which suggests that hybridization might be a rare event. CONCLUSION: Among the examined mechanisms, heterospecific pollen deposition might have the largest deleterious effect on the native species. This effect is frequency dependent; thus, a positive feedback loop may cause the effect on the population dynamics to increase over time, with the result that the alien might eventually displace the native in a population. Effects of the examined mechanisms on population dynamics should be investigated further to improve understanding of the impact of reproductive interference on the structure of plant communities.

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Calophyllum honbaense (Clusiaceae), A new species from Hon Ba Nature Reserve, Southern Vietnam

Dang Van-Son, Toyama Hironori, Tagane Shuichiro, Hoang Nghia-Son, Naiki Akiyo

TAIWANIA   64 ( 1 ) 86 - 89   2019年03月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Lasianthus bidoupensis (Rubiaceae), a New Species from Southern Vietnam

Dang V.S., Tagane S., Hoang N.-S., Toyama H., Naiki A.

Annales Botanici Fennici ( FINNISH ZOOLOGICAL BOTANICAL PUBLISHING BOARD )  56 ( 1-3 ) 191 - 195   2019年02月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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A new species, Lasianthus bidoupensis V.S. Dang & Naiki (Rubiaceae) is described and illustrated from Bidoup Nui Ba National Park, Lam Dong Province, southern Vietnam. It resembles L. yaharae which was recently discovered from Mt. Hon Ba and L. dalatensis which is endemic to Dalat, southern Vietnam. However, L. bidoupensis differs from them by having larger leaves and bracts, longer petioles, stipules, calyx and corolla tubes, and deep-red mature fruits.

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Two new species of Lasianthus (Rubiaceae) from Hoang Lien National Park, northern Vietnam

Dang V., Naiki A.

Phytotaxa ( MAGNOLIA PRESS )  423 ( 1 ) 33 - 40   2019年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Two new species, Lasianthus fansipanensis V.S. Dang & Naiki and Lasianthus sapaensis V.S. Dang & Naiki (sect. Nudiflorae), were discovered in the Hoang Lien National Park of northern Vietnam and are here described and illustrated. Colour photographs, preliminary conservation assessment, and tables comparing these two new species against two closely related species are also presented.

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Two New Species of Neolitsea (Lauraceae), N. kraduengensis from Thailand and N. vuquangensis from Vietnam and an Analysis of their Phylogenetic Positions using ITS sequences

Mitsuyuki Chika, Tagane Shuichiro, Nguyen Van Ngoc, Hoang Thi Binh, Suddee Somran, Rueangruea Sukid, Toyama Hironori, Mase Keiko, Yang Chen-Jue, Naiki Akiyo, Yahara Tetsukazu

Acta Phytotaxonomica et Geobotanica ( 日本植物分類学会 )  69 ( 3 ) 161 - 173   2018年10月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Two novel species of Neolitsea (Lauraceae), Neolitsea kraduengensis Tagane & Yahara and N. vuquangensis Mitsuyuki & Yahara, are described and illustrated. Neolitsea kraduengensis occurs in Phu Kradueng National Park, Loei Province, Northeast Thailand. Neolitsea vuquangensis is in Vu Quang National Park, Ha Tinh Province, North Central Vietnam. Morphological differences of the two species from similar species are presented. A phylogenetic tree reconstructed from ITS sequences supports their distinctiveness. Two phenotypically similar species, Neolitsea aurata and N. vuquangensis , with dense golden yellow hairs on the leaf blades, are not sister to each other.

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Contributions to the Flora of Myanmar II: New records of eight woody species from Tanintharyi Region, Southern Myanmar

Tagane S.

Natural History Bulletin of the Siam Society ( Natural History Bulletin of the Siam Society )  63 ( 1 ) 47 - 56   2018年10月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Erythroxylum calyptratum (Erythroxylaceae), a new species from Mt. Fansipan, northern Vietnam

Komada N., Tagane S., Ngoc T. N., Binh H. T., Son H. T., Toyama H., Nagamasu H., Naiki A.

Phytotaxa ( Magnolia Press )  347 ( 4 ) 279 - 284   2018年04月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Erythroxylum calyptratum, sp. nov. (Erythroxylaceae), from Mt. Fansipan, Hoang Lien National Park, Lao Cai Province, northern Vietnam, is newly described. The new species is characterized by thinly chartaceous leaves with 2–3 mm long petiole, 1–3 flowered inflorescences, downward facing white flowers, well-developed petal appendages (1/3–1/2 length of petals) and entirely free 3 styles. A description, illustrations, DNA barcodes of rbcL and matK and a key to the species of Erythroxylum in Indochina are provided.

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A new record Lasianthus cambodianus Pit. (Rubiaceae) for the flora of Vietnam

Dang VS, Tagane S, Toyama H, Ngoc NV, Son HN, Naiki A

Journal of biotechnology   15 ( 3A ) 263 - 267   2018年04月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Lecanorchis sarawakensis (Orchidaceae, vanilloideae), a new mycoheterotrophic species from sarawak, Borneo

Suetsugu K., Yiing L. C., Naiki A., Tagane S., Takeuchi Y., Toyama H., Yahara T.

Phytotaxa ( MAGNOLIA PRESS )  338 ( 1 ) 135 - 139   2018年02月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Contributions to the Flora of Myanmar: I: Nine taxa of monocots newly recorded from Myanmar

TANAKA Nobuyuki, TAGANE Shuichiro, NAIKI Akiyo, AUNG Mu Mu, TANAKA Noriyuki, DEY Santanu, MOOD John, MURATA Jin

Bulletin of the National Museum of Nature and Science. Series B. Botany   44 ( 1 ) 31‐39   2018年02月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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  J-GLOBAL

Gentiana laotica, a new species of Gentianaceae from Laos

Souladeth P., Tagane S., Naiki A., Nagamasu H., Yahara T.

Thai Forest Bulletin (Botany)   46 ( 1 ) 72 - 75   2018年01月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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© 2018 The Forest Herbarium A new species of Gentiana (Gentianaceae), G. laotica Soulad., Tagane &amp; Yahara, from Phou Khao Khouay National Protected Area, Vientiane Province, central Laos, is described. Photographs, vernacular name, DNA barcodes of rbcL, matK and ITS, and preliminary conservation status are provided for the new species.

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Five new species of syzygium (Myrtaceae) from Indochina and Thailand

Tagane S., Dang V. S., Souladeth P., Nagamasu H.,Toyama H., Naiki A., Fuse K., Tran H., Yang C.-J., Prajaksood A., Yahara T.

Phytotaxa   375 ( 4 ) 247 - 260   2018年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Mussaenda recurvata (Rubiaceae), a new species from southern vietnam with observations on its heterostyly

Naiki A., Tagane S., Toyama H., Dang V. S., Yahara T.

Phytotaxa ( MAGNOLIA PRESS )  328 ( 2 ) 167 - 174   2017年11月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Herein, Mussaenda recurvata, a new species from Hon Ba Nature Reserve, southern Vietnam, is described and illustrated. This species is morphologically similar to M. longipetala, distributed from southern China to northern Vietnam, in having recurved stipules and densely pilose and puberulent hairs throughout, but differs in its strongly recurved calyx lobes, a shorter corolla tube, and ovate corolla lobes. The species is morphologically heterostylous and it appears to be functionally dioecious. An updated key to Mussaenda species in Vietnam, Laos, and Cambodia is also provided.

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<i>Macrosolen bidoupensis</i> (Loranthaceae), a new species from Bidoup Nui Ba National Park, southern Vietnam.

Tagane S, Dang VS, Ngoc NV, Binh HT, Komada N, Wai JS, Naiki A, Nagamasu H, Toyama H, Yahara T

PhytoKeys ( PhytoKeys )  ( 80 ) 113 - 120   2017年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Macrosolen bidoupensis Tagane &amp V.S.Dang, sp. nov. (Loranthaceae) is newly described from Bidoup Nui Ba National Park in Lam Dong Province, southern Vietnam. The new species is characterized by small broadly elliptic to circular leaves, sessile to short petioles, slightly cordate to rounded leaf bases, 4-5 pairs of lateral veins and a basally green corolla tube. An illustration, a summary of DNA barcoding of the plastid genes rbcL and matK, and a key to the species of Macrosolen in Vietnam are provided.

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Garcinia hopii (Clusiaceae), a new species from Bidoup Nui Ba National Park, southern Vietnam.

Hironori Toyama, Van-Son Dang, Shuichiro Tagane, Ngoc Van Nguyen, Akiyo Naiki, Hidetoshi Nagamasu, Tetsukazu Yahara

PhytoKeys ( PENSOFT PUBL )  77   63 - 70   2017年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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A new species, Garcinia hopii H. Toyama & V. S. Dang is described from Bidoup Nui Ba National Park, southern Vietnam. This species is similar to Garcinia hendersoniana Whitmore but differs from that species in having larger leaves, clustered pistillate flowers, a greater number of sterile anthers and a larger stigma of young fruits. A description, preliminary conservation assessment, illustration, photographs and DNA barcodes of the new species are provided, as well as an updated key to Garcinia sect. Hebradendron in Indochina.

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Heteropanax thaiensis, a new species and Schefflera wrayi (Araliaceae), a new record to Thailand

Tagane S.

Thai Forest Bulletin (Botany) ( Thai Forest Bulletin (Botany) )  45 ( 2 ) 99 - 104   2017年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Two New Taxa and One New Report of Tarenna (Rubiaceae) for the Flora of Cambodia and Vietnam

Naiki Akiyo, Tagane Shuichiro, Chhang Phourin, Van-Son Dang, Toyama Hironori, Nagamasu Hidetoshi, Yahara Tetsukazu

ACTA PHYTOTAXONOMICA ET GEOBOTANICA   68 ( 2 ) 93 - 100   2017年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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New Distributional Records of the Mycoheterotrophic Sciaphila alba (Triuridaceae), outside the Type Locality (vol 68, pg 123, 2017)

Kenji Suetsugu, Akiyo Naiki, Yayoi Takeuchi, Hironori Toyama, Shuichiro Tagane, Tetsukazu Yahara

ACTA PHYTOTAXONOMICA ET GEOBOTANICA ( JAPANESE SOC PLANT SYSTEMATICS, UNIV TOKYO, GRADUATE SCH )  68 ( 3 ) 204 - 204   2017年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Two New Taxa and One New Report of <i>Tarenna </i>(Rubiaceae) for the Flora of Cambodia and Vietnam

Naiki Akiyo, Tagane Shuichiro, Chhang Phourin, Dang Van-Son, Toyama Hironori, Nagamasu Hidetoshi, Yahara Tetsukazu

Acta Phytotaxonomica et Geobotanica ( 日本植物分類学会 )  68 ( 2 ) 93 - 100   2017年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

A new species, <i>Tarenna aurantiaca </i>Naiki & Tagane (Rubiaceae) from Hon Ba Nature Reserve, southern Vietnam, and a new variety <i>T. pilosa </i>var. <i>parvifolia </i>Naiki & Tagane from Bokor Nature Reserve, southern Cambodia, are described and illustrated. <i>Tarenna costata </i>(Miq.) Merr. is reported for the first time for the flora of Cambodia. A key to the species of <i>Tarenna </i>in Indochina, including Cambodia, Laos and Vietnam, is provided.

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New Localities and Flower Morphology for <i>Lasianthus giganteus </i>(Rubiaceae)

Naiki Akiyo, Tagane Shuichiro, Ngoc Nguyen Van, Toyama Hironori, Yahara Tetsukazu

Acta Phytotaxonomica et Geobotanica ( 日本植物分類学会 )  68 ( 1 ) 59 - 62   2017年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

<i>Lasianthus giganteus </i>Naiki (Rubiaceae), first found in Cambodia, was recently discovered in central Vietnam and southern Thailand. We describe the floral morphology of this species for the first time.

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New Distributional Records of the Mycoheterotrophic <i>Sciaphila alba </i>(Triuridaceae), outside the Type Locality

Suetsugu Kenji, Naiki Akiyo, Takeuchi Yayoi, Toyama Hironori, Tagane Shuichiro, Yahara Tetsukazu

Acta Phytotaxonomica et Geobotanica ( 日本植物分類学会 )  68 ( 2 ) 123 - 126   2017年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

Two new localities of the mycoheterotrophic plant, <i>Sciaphila alba </i>(Triuridaceae), are reported and the description of its morphology, in particular on color polymorphism of staminate flowers, based on a new collection from Tatau, Sarawak and from herbarium studies at KYO is updated. <i>Sciaphila alba </i>had been reported only from Lambir Hills National Park, Sarawak, Borneo.

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Morphological and Molecular Phylogenetic Analyses of <i>Geranium yesoense </i>(Geraniaceae) in Japan

Wakasugi Yuki, Azuma (Present Name: Suzuki) Hiroshi, Naiki Akiyo, Nishida Sachiko

Acta Phytotaxonomica et Geobotanica ( 日本植物分類学会 )  68 ( 3 ) 129 - 144   2017年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

<i>Geranium yesoense </i>(Geraniaceae) includes several varieties that are mainly discriminated by two morphological features, namely, the degree of leaf incision and the density of spreading hairs on the sepals, but these features have never been objectively quantified. To clarify whether these features can truly discriminate varieties, we analyzed leaf shape and sepal pubescence, and conducted a molecular phylogenetic analysis using nuclear and chloroplast DNA. Our morphological analyses showed some trends in leaf morphology and density of hairs, but failed to identify any groupings that could be clearly distinguished on the basis of these features. Our molecular analysis recognized <i>G. yesoense </i>as a distinct taxon, but did not support the existence of subgroups within the species. We conclude that <i>G. yesoense </i>must be treated as a single taxon with some tendency toward morphological variation depending on locality and habitat.

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Two New Taxa and One New Report of Tarenna (Rubiaceae) for the Flora of Cambodia and Vietnam (vol 68, pg 93, 2017)

Naiki Akiyo, Tagane Shuichiro, Chhang Phourin, Dang Van-Son, Toyama Hironori, Nagamasu Hidetoshi, Yahara Tetsukazu

ACTA PHYTOTAXONOMICA ET GEOBOTANICA   68 ( 3 ) 203 - 203   2017年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Lysimachia kraduengensis (Primulaceae), a new species from northeastern Thailand

Julius A.

Phytotaxa ( Phytotaxa )  289 ( 1 ) 69 - 76   2016年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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A new species of Primulaceae from Thailand, Lysimachia kraduengensis, is described and illustrated. It is morphologically similar to L. engleri, L. lancifolia, L. laxa and L. sikokiana in having solitary and axillary flowers, a yellow corolla, relatively long pedicels and basifixed anthers. The new species can be distinguished by the combination of its height, leaf texture, petiole, calyx and anther length, and brown coloration on the flowers. In addition, the conservation status, an updated key to Lysimachia species in Thailand, and discussion of the systematic placement of the new species based on the trnL-F marker of chloroplast DNA are provided.

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Two new combinations of Leptopetalum (Rubiaceae) based on molecular phylogenetic evidence

内貴 章世

■■■ ( ツムラ )  91 ( 6 ) 337 - 344   2016年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

A new species of smilax (Smilacaceae) from southern islands of Kagoshima Prefecture, Japan

Qi Z.

Phytotaxa ( Phytotaxa )  269 ( 2 ) 128 - 130   2016年08月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Lasianthus honbaensis (Rubiaceae), a New Species from Southern Vietnam

Dang V.

Annales Botanici Fennici ( Annales Botanici Fennici )  53 ( 3-4 ) 263 - 266   2016年08月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Lasianthus honbaensis (Rubiaceae), a new species from southern Vietnam

Van-Son Dang, Tagane Shuichiro, Toyama Hironori, Naiki Akiyo, Nagamasu Hidetoshi, Yahara Tetsukazu

ANNALES BOTANICI FENNICI   53 ( 3-4 ) 263 - 266   2016年08月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

A new species of Eustigma (Hamamelidaceae) from Hon Ba Nature Reserve, Vietnam.

Toyama H, Tagane S, Dang VS, Tran H, Nagamasu H, Naiki A, Yahara T

PhytoKeys ( PhytoKeys )  65 ( 65 ) 47 - 55   2016年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

A new species of Hamamelidaceae, Eustigma honbaense H. Toyama, Tagane & V.S. Dang, sp. nov., is described from Hon Ba Nature Reserve, Vietnam. This species is similar to Eustigma oblongifolium Gardner & Champ., but differs from it in having entire leaves, longer infructescences, capsules with a longer apical part and seeds with a larger hilum. A description, preliminary conservation assessment, illustration and photographs of the new species are provided, as well as an updated key to the genus Eustigma.

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A New Record of <i>Gaertnera junghuhniana </i> Miq. (Rubiaceae) from Southern Vietnam

Tagane Shuichiro, Naiki Akiyo, Dang Van Son, Yahara Tetsukazu

Acta Phytotaxonomica et Geobotanica ( 日本植物分類学会 )  67 ( 2 ) 127 - 130   2016年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

<i>Gaertnera junghuhniana </i> was newly recorded from Hon Ba Nature Reserve, Khanh Hoa Province, southern Vietnam.

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Glycosmis suberosa (Rutaceae), a new species from Khao Luang National Park, Peninsular Thailand

Toyama H.

Thai Forest Bulletin (Botany) ( Thai Forest Bulletin (Botany) )  44 ( 2 ) 116 - 121   2016年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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A new record of Burmannia championii Thwaites (Burmanniaceae) from Southern Vietnam

Dang VS, Tagane S, Toyama H, Yahara T, Naiki A, Nguyen HQ, Tran H

Journal of Biotechnology   13 ( 4A ) 1393 - 1396   2015年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Chromosome Numbers for Two Species of Damnacanthus (Rubiaceae) from China

Naiki Akiyo, Li En-Xian, Wu Jian-Yong, Qin Hai-Ning

ACTA PHYTOTAXONOMICA ET GEOBOTANICA   66 ( 3 ) 189 - 191   2015年10月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Flora of Bokor National Park, Cambodia II: Four New Species and Nine New Records of Lasianthus (Rubiaceae) from Cambodia

Naiki Akiyo, Tagane Shuichiro, Chhang Phourin, Toyama Hironori, Zhu Hua, Dang Van-Son, Yahara Tetsukazu

ACTA PHYTOTAXONOMICA ET GEOBOTANICA   66 ( 3 ) 153 - 179   2015年10月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Chromosome Numbers for Two Species of <i>Damnacanthus </i>(Rubiaceae) from China

Naiki Akiyo, Li En-Xian, Wu Jian-Yong, Qin Hai-Ning

Acta Phytotaxonomica et Geobotanica ( 日本植物分類学会 )  66 ( 3 ) 189 - 191   2015年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

Counts of the somatic chromosomes of two species of <i>Damnacanthus </i>from China are reported here forthe first time: <i>Damnacanthus officinarum </i>was found to be diploid with 2<i>n </i>= 22+1B, while <i>D. hainanensis</i>was found to be tetraploid with 2<i>n </i>= 44+1B.

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Aporosa tetragona Tagane &amp; V. S. Dang (Phyllanthaceae), a new species from Mt. Hon Ba, Vietnam.

Tagane S, Dang VS, Toyama H, Naiki A, Hidetoshi Nagamasu, Yahara T, Tran H

PhytoKeys ( PhytoKeys )  57 ( 57 ) 51 - 60   2015年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Flora of Bokor National Park, Cambodia II : Four New Species and Nine New Records of Lasianthus (Rubiaceae) from Cambodia

NAIKI AKIYO, TAGANE SHUICHIRO, CHHANG PHOURIN, TOYAMA HIRONORI, ZHU HUA, DANG VAN-SON, YAHARA TETSUKAZU

Acta Phytotaxonomica et Geobotanica ( 日本植物分類学会 )  66 ( 3 ) 153 - 179   2015年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

Twenty four species of Lasianthus are documented from Bokor National Park, Kampot Province, Cambodia. Four new species, Lasianthus bokorensis, L. giganteus, L. oblanceolatus, and L. stephanocalycinus, are described based on newly collected materials. Nine species, L. austrosinensis, L. biflorus, L. chevalieri, L. clementis, L. curtisii, L. hispidulus, L. latifolius, L. sarmentosus, and L. viridiramulis, are newly recorded from Cambodia. Lasianthus viridiramulis is proposed as a replacement name for Lasianthus brevipes Craib non Valeton.

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Toona calcicola, a new species and Reinwardtiodendron humile, a new record to Thailand

Rueangruea S.

Thai Forest Bulletin (Botany) ( Thai Forest Bulletin (Botany) )  ( 43 ) 79 - 86   2015年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

Two species of Meliaceae, Toona calcicola and Reinwardtiodendron humile are newly added for fl ora of Thailand. Toona calcicola, a new species from Suan Hin Pha Ngam Forest Park, Loei Province, is described and illustrated. This species is endemic to ridge of limestone hill and characterized by Cycas petraea A.Lindstr. &amp; K.D.Hill and Dracaena cambodiana Pierre ex Gagnep. Since this is the fi rst account of the genus Reinwardtiodendron to the fl ora of Thailand, the key to the genera of Meliaceae (based on fl owers) in Thailand is revised.

Breeding System and Seed Production in Pin‐monomorphic Populations of a Distylous Perennial, Ophiorrhiza japonica (Rubiceae) on Iriomote Island, Japan

NAKAGAWA Masato, NAIKI Akiyo

Acta Phytotaxonomica et Geobotanica ( 日本植物分類学会 )  65 ( 1 ) 43 - 48   2014年02月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

The breeding system and seed production of a distylous perennial, Ophiorrhiza japonica, were analyzed on Iriomote Island, located near the southwestern end of the Ryukyu Islands. On Iriomote, O. japonica is monomorphic with a pin morph. Artificial pollination experiments confirmed self- and intramorph compatibility in the populations, but automatic self-pollination was not detected. Seed set in 12 sampling plots in two natural populations was constant and abundant, indicating high pollinator availability. Our results indicate that self compatibility can be assumed to have been important in the establishment of the monomorphic populations on Iriomote Island. The loss of distyly is not characterized by specialization in self-fertilization, but rather intramorph compatibility can be assumed to have been more important in maintenance of the pin-monomorphic population as a factor facilitating outbreeding

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Development of microsatellite markers for Croomia japonica and cross-amplification in its congener

Ming Fang, Chen-Xi Fu, Cheng-Xin Fu, You-Lin Zhu, Akiyo Naiki, En-Xiang Li

SCIENTIA HORTICULTURAE ( ELSEVIER SCIENCE BV )  161   228 - 232   2013年09月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

Croomia is a small monocotyledonous genus with eastern Asian eastern North American floristic disjunction. The Croomia species are endangered and in urgent need of conservation. In this study, we report the development and characterization of 11 polymorphic compound microsatellite markers from Croomia japonica. Moreover, transferability and polymorphism of these primers was tested across Croomia heterosepala and Croomia pauciflora. All of them were transferable and polymorphic in these species. The number of alleles per locus ranged from 2 to 14 (mean: 7.7), 2 to 20 (mean: 7.3) and 2 to 16 (mean: 8.2), while the observed (and expected) heterozygosities ranged from 0.053 to 1.000 (0.053-0.918), 0.000 to 1.000 (0.656-0.945) and 0.190 to 0.905 (0.251-0.937) in populations of C japonica, C heterosepala and C pauciflora, respectively. Most loci in the Croomia populations deviated significantly from the HWE expectations. Significant heterozygosity deficiency was found but no bottleneck was detected in Croomia. These polymorphic markers will be useful tool to study the genetic diversity and the population genetic structure, evolution of Croomia species and for establishment of effective conservation strategies. (C) 2013 Elsevier B.V. All rights reserved.

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Molecular Phylogenetic Analyses of Geranium robertianum Populations Recently Found in Japan

NISHIDA SACHIKO, AZUMA HIROSHI, NAIKI AKIYO, OGAWA MAKOTO

Acta phytotaxonomica et geobotanica : APG   62 ( 2 ) 79 - 87   2012年06月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Heterostyly and the possibility of its breakdown by polyploidization

Akiyo Naiki

PLANT SPECIES BIOLOGY ( WILEY-BLACKWELL )  27 ( 1 ) 3 - 29   2012年01月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

Heterostyly is a genetically controlled sexual polymorphism promoting outcrossing by animal pollinators. The occurrence of heterostyly in angiosperms was investigated, and 199 genera in 28 families in 15 orders were recognized as taxa that contain heterostylous species. A correlation between the occurrence of heterostyly and ploidy level was found in some limited groups in Primulaceae and Rubiaceae. In such taxa, individuals with a lower ploidy level tended to have heterostyly and individuals with a higher ploidy level tended to have monomorphic flowers. It appears reasonable that the first step of the breakdown of heterostyly was the recombination of the supergene in a diploid heterostylous plant, and then poyploidization incidentally occurred. Polyploidization itself does not necessarily appear to have direct effects on the breakdown of heterostyly.

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大阪市立自然史博物館収蔵種子植物標本目録4-ニシキギ科-

藤井伸二, 内貴章世

自然史研究 : Shizenshi-kenkyu, occasional papers from the Osaka Museum of Natural History ( 大阪市立自然史博物館 )  3 ( 10 ) 143 - 158   2009年12月

掲載種別: 研究論文（大学，研究機関紀要）

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Population genetic structure, phylogeography, and demographic history of Platycrater arguta (Hydrangeaceae) endemic to East China and South Japan, inferred from chloroplast DNA sequence variation

Qiu Ying-Xiong, Qi Xin-Shuai, Jin Xiao-Feng, Tao Xiao-Yu, Fu Cheng-Xing, Naiki Akiyo, Comes Hans Peter

TAXON   58 ( 4 ) 1226 - 1241   2009年11月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Pollen morphology of the genus Skimmia (Rutaceae) and its taxonomic implications

Tomoko Fukuda, Akiyo Naiki, Hidetoshi Nagamasu

JOURNAL OF PLANT RESEARCH ( SPRINGER TOKYO )  121 ( 5 ) 463 - 471   2008年09月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

Pollen morphology of the genus Skimmia was studied. Of six species of the genus, five species were investigated by light microscopy and scanning electron microscopy. Pollen grains of Skimmia had striate to striate-reticulate sculpture and variable aperture number (3-7), and these characters differed from even the phylogenetically closest relatives such as Dictamnus and Casimiroa which have 3-colporate pollen grains with reticulate exine. In Skimmia laureola, pollen dimorphism is suggested in the aperture number in accordance with the floral system. Pollen grains of Skimmia japonica, a morphologically very variable species, were extensively surveyed covering its whole distribution area. The grains were also striate to striate-reticulate, and the exine sculpture was not different between varieties. However, the aperture number of S. japonica showed a geographical variation ranging from 4 to 6; in Sakhalin, Hokkaido, most part of Honshu and Taiwan, grains with 4-5 apertures were dominant, while in the southern part of Japan, including the Ryukyu Islands and the Izu Islands, those with 5-6 apertures were common.

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大和川水系におけるアリドオシ(アカネ科)の分布と染色体数

内貴章世, 大阪市立自然史博物館大和川水系調査グループ植物班

Bulletin of the Osaka Museum of Natural History ( 大阪市立自然史博物館 )  62   2008年03月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

大和川水系におけるアリドオシ(アカネ科)の分布と染色体数

内貴章世, 大阪市立自然史博物館大和川水系調査グループ植物班

Bulletin of the Osaka Museum of Natural History ( 大阪市立自然史博物館 )  62   2008年03月 [ 査読有り ]

掲載種別: 研究論文（大学，研究機関紀要）

Karyotypic analysis of Skimmia japonica (Rutaceae) and related species

Tomoko Fukuda, Akiyo Naiki, Hidetoshi Nagamasu

JOURNAL OF PLANT RESEARCH ( SPRINGER TOKYO )  120 ( 1 ) 113 - 121   2007年01月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

A karyotypic analysis of three species of Skimmia (Rutaceae) in East Asia was performed that examined 88 individuals from 53 localities. Chromosome numbers of S. japonica, S. reevesiana and S. arisanensis were 2n=30, 31, 32 (=30+0-2B), 2n=60 and 2n=60, respectively. The chromosome number of S. arisanensis was reported for the first time. All species had a large chromosome pair or quartet (the first pair or quartet) with a median - submedian centromere in the karyotype. In S. japonica the arm ratio of this first pair was considerably variable and showed a geographical pattern. In the northern half of the distribution range, Sakhalin, Hokkaido, Honshu, Shikoku and part of Kyushu, the arm ratio was 1-1.2, while in the southern half, part of Kyushu, Ryukyu and Taiwan, the arm ratio was very variable and ranged from 1.2 to 2.4. In S. japonica the first pair was sometimes rather heteromorphic; however, the heteromorphism was not related to sex of the plant.

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Mating system, seed production and population genetic structure of Ophiorrhiza japonica (Rubiaceae) in Iriomote Island, Japan

NAKAGAWA Masato, NAIKI Akiyo, TAKASO Tokushiro

Journal of plant research   119   2006年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

近畿地方の植物分布に関する最近の知見と文献一覧

藤井伸二, 藤井伸二, 藤井俊夫, 角野康郎, 小林禧樹, 栗林実, 黒崎史平, 丸井英幹, 光田重幸, 三浦励一, 村田源, 永益英敏, 内貴章世, 岡本素治, 迫田昌弘, 瀬戸剛, 梅原徹, 山住一郎, 藤井伸二, 藤井俊夫, 角野康郎, 小林禧樹, 栗林実, 黒崎史平, 丸井英幹, 光田重幸, 三浦励一, 村田源, 永益英敏, 内貴章世, 岡本素治, 迫田昌弘, 瀬戸剛, 梅原徹, 山住一郎

分類   6 ( 2 )   2006年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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  J-GLOBAL

Phylogeny and breakdown of distyly correlated with polyploidization in Damnacanthus (Rubiaceae).

Naiki, A, H. Nagamasu

XVII International Botanical Congress － Abstract: 439     2005年07月 [ 査読有り ]

掲載種別: 研究論文（その他学術会議資料等）

1930年前後における水草の分布状況に関する資料の紹介--三木茂水草コレクション

藤井 伸二, 内貴 章世

水草研究会誌 ( 水草研究会 )  ( 82 ) 36 - 44   2005年04月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Morphological variation in leaf domatia enables coexistence of antagonistic mites in Cinnamomum camphora

S Nishida, A Naiki, T Nishida

CANADIAN JOURNAL OF BOTANY-REVUE CANADIENNE DE BOTANIQUE ( NATL RESEARCH COUNCIL CANADA )  83 ( 1 ) 93 - 101   2005年01月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

We examined variation in Cinnamomum camphora (L.) J. Presl (Lauraceae) leaf domatium morphology with respect to domatium inhabitants in the tree's natural habitats. Canonical discriminant analysis revealed that domatium morphology could be classified into four different types: pouch type, domatia with a narrow (about 0.06 mm) pubescent opening; pubescent pit type, domatia with a wider (about 0.21 mm) pubescent opening; glabrous pit type, domatia similar to the pubescent pit type but with a glabrous opening; and dish type, domatia with a wide (about 0.26 mm) glabrous opening. These four domatium types were found in different positions on a leaf, and domatia with narrower openings tended to occur in or near the position between the midrib and basal secondary veins. The four domatium types were associated, respectively, with herbivorous Eriophyidae mites and herbivorous or fungivorous Tarsonemidae mites; with carnivorous Stigmaeidae mites; with Stigmaeidae mites and egg shells or excuviae of carnivorous Phytoseiidae mites; and with egg shells or excuviae of Phytoseiidae mites. These results suggest that different mites use different domatia, even on the same C. camphora leaf. This conclusion may explain the different results in previous reports about domatium fauna. It suggests that ecological interactions within the plant-herbivore-carnivore system are complicated.

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  DOI

Correlation between distyly and ploidy level in Damnacanthus (Rubiaceae).

Naiki A, Nagamasu H

American journal of botany ( American Journal of Botany )  91 ( 5 ) 664 - 671   2004年05月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Somatic chromosomes were observed in 661 individuals of 14 taxa, nine species and five varieties, of Damnacanthus (Rubiaceae). Chromosome numbers are reported for the first time for 13 taxa. Diploid (2n = 22) and tetraploid (2n = 44) counts were obtained. Distyly is reported for the first time for four species, D. angustifolius, D. henryi, D. labordei, and D. officinarum. A strong correlation exists between chromosome number and occurrence of distyly. Regardless of taxa in Damnacanthus, distylous populations are diploid, and monomorphic populations are tetraploid. Flowers of the monomorphic populations observed have a long style and short stamens with few exceptions. Polyploidization may have caused the breakdown of distylous to monomorphic flowers. In D. indicus, leaves from the tetraploid populations tend to be larger than those from the diploid populations. Populations of tetraploid D. indicus were distributed in more northern areas than those of the diploid. Three types of sympatric distribution were found for the varieties of D. indicus in Japan: diploid and tetraploid, two diploids, and two tetraploids. Based on the present chromosome number study, the taxonomy of the varieties of D. indicus should be revised.

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  DOI
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  PubMed

Unusual flowering shoots in Damnacanthus (Rubiaceae)

Naiki, A, H. Nagamasu

Acta Phytotaxonomica et Geobotanica ( 日本植物分類学会 )  55 ( 2 ) 129 - 132   2004年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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The spine of Damnacanthus has been interpreted as a metamorphosed leaf or a lateral branch. There is a hypothesis that a pair of spines is modified inflorescence by the observation in which vegetative and reproductive branching units are comparable to each other. Our observations of various transitional forms between the spines and the pedicels in Damnacanthus agree with the hypothesis.

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  DOI
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  CiNii Research

アリドオシ属(アカネ科)の分類学的および二型花柱性に関する研究(学位論文紹介)

内貴 章世

分類 ( 日本植物分類学会 )  4 ( 1 ) 91 - 94   2004年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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  DOI

Correlation between distyly and ploidy level in Demnacnathus (Rubiaceae)

NAIKI A

Am J Bot   91   664 - 671   2004年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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  CiNii Research

Correlation between distyly and ploidy level in Damnacanthus (Rubiaceae)

NAIKI A

Am J Bot   91   664 - 671   2004年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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  CiNii Research

Distyly and pollen dimorphism in Damnacanthus (Rubiaceae)

A Naiki, H Nagamasu

JOURNAL OF PLANT RESEARCH ( SPRINGER-VERLAG TOKYO )  116 ( 2 ) 105 - 113   2003年04月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

We document distyly in Damnacanthus (Rubiaceae) and investigate pollen morphology in the genus. Within nine taxa in Japan (four species, four varieties and one form), five show distyly. Non-distylous taxa of Damnacanthus always have a long style and short stamens. We examined the pollen morphology of all taxa of Damnacanthus in Japan. The pollen grains of Damnacanthus are 3- to 5-orthocolporate or sometimes loxocolporate. Polymorphic pollen is sometimes observed even within a single flower. Pollen dimorphism is associated with distyly; pollen grains from short-styled (thrum) flowers are significantly larger than those from long-styled (pin) flowers, and the muri are smooth in pin flowers whereas the pollen grains of thrum flowers have minute granules on the top and/or on the sides. In non-distylous taxa, in which the style is longer than stamens, the muri are always provided with minute granules. Interestingly, the pollen grains with granules in the non-distylous taxa contrast with the pollen of the distylous taxa, because granulate pollen grains are found only in thrum flowers. Although Damnacanthus is a stenopalynous genus, the number of colpi is useful for delimiting taxa. Based on palynological characters, we conclude that Damnacanthus should be revised.

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  PubMed

Carex jubozanensis (Cyperaceae), a new species from Japan

Oda, J, A. Tanaka, A. Naiki, H. Nagamasu

Acta Phytotaxonomica et Geobotanica ( 日本植物分類学会 )  54 ( 2 ) 127 - 135   2003年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

Carex (sect. Rhomboidales) jubozanensis J. Oda & A. Tanaka is described as a new species from the western and central Honshu, Japan. This new species is characterized and clearly distinguished from its allies in the sect. Rhomboidales by the actively stoloniferous habit and the emarginate scales of both staminate and pistillate flowers. The micromorphology of achene surface is also different from that of its allies.

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  CiNii Research

Pollination system and evolution of dioecy from distyly in Mussaenda parviflora (Rubiaceae)

Akiyo Naiki, Makoto Kato

Plant Species Biology ( Plant Species Biology )  14 ( 3 ) 217 - 227   1999年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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The floral morphology arid reproductive ecology of a scandent shrub species, Mussaenda parviflora Miq. (Rubiaceae), were studied on Iriomote and Amami Ohshima Islands, Japan. The morphological study demonstrated that M. parviflora was gynodioecious. Crossing experiments, however, revealed that if was functionally dioecious. The flowers were visited mainly by butterflies in the daytime and mainly by crepuscular hawkmoths in the evening. Dioecy in this species is thought to have evolved from distyly. Dioecy of this species, which is pollinated by long-tongued Lepidoptera, is unusual as the evolution of dioecy from distyly in plants with long corolla tubes is thought to have been triggered by a pollinator shift from long- to short-tongued insects. In this species, however, two floral morphological features may have caused the evolution. The first feature is the presence of many upward-facing hairs covering the inner Surface of the upper part of the corolla tube these hairs appear to have impeded pollen flow from long- to short-styled flowers. The second feature is the overlap in anther height between the two types of flowers, which may have reduced seed set by clogging stigma with incompatible pollen grains. Accordingly, male sterility in long-styled plants may have evolved.

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  DOI