論文 - 内貴　章世

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）

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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）

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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）

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<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）

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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）

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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）

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<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）

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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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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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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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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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