論文 - 内貴　章世

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）

• この論文にアクセスする

  DOI

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）

　概要を見る

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.

• この論文にアクセスする

  DOI

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）

　概要を見る

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.

• この論文にアクセスする

  DOI
• 関連情報を調べる
  CiNii Research

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）

• この論文にアクセスする

  DOI
• 関連情報を調べる
  CiNii Research

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）

　概要を見る

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.

• この論文にアクセスする

  DOI

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）

　概要を見る

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.

• この論文にアクセスする

  DOI

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）

　概要を見る

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.

• この論文にアクセスする

  DOI

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）

　概要を見る

© 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.

• この論文にアクセスする

  DOI

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）

　概要を見る

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.

• この論文にアクセスする

  DOI

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）

• 関連情報を調べる
  CiNii Research

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）

　概要を見る

© 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.

• この論文にアクセスする

  DOI

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）

　概要を見る

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.

• この論文にアクセスする

  DOI
• 関連情報を調べる
  PubMed

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）

• この論文にアクセスする

  DOI

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）

　概要を見る

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.

• この論文にアクセスする

  DOI
• 関連情報を調べる
  PubMed

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）

• この論文にアクセスする

  DOI

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）

　概要を見る

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.

• この論文にアクセスする

  DOI

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）

　概要を見る

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.

• この論文にアクセスする

  DOI