研究者詳細 - 傳田　哲郎

論文 - 傳田　哲郎

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ミヤコジシバリ (キク科) とその推定親種 (オオジシバリ・ハマニガナ) における光環境に応じた葉と走出枝の組織形態学的変化

水野拓, 傳田哲郎

沖縄生物学会誌 ( 沖縄生物学会 ) 63 29 - 41 2025年03月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

琉球列島固有のミヤコジシバリ (キク科) はオオジシバリとハマニガナの雑種で, 三倍体から八倍体の 6種類の倍数体で構成される. 琉球列島ではオオジシバリとミヤコシバリの種の境界が曖昧なため, 本研究ではこれらを総称してオオジシバリ複合体と呼ぶ. 九州以北のオオジシバリとは異なり, オオジシバリ複合体は砂浜に多く出現する. 砂浜環境への形態的適応の有無を調べるため, オオジシバリ複合体の六倍体と八倍体, 九州以北のオオジシバリ, ハマニガナを強光と弱光下で栽培し, 葉と走出枝の組織を比較した. その結果,六倍体と八倍体は強光下で柵状組織が発達した厚い葉と太い走出枝を形成した. 一方, 九州以北のオオジシバリも光強度に応じた形態的可塑性を示したが, オオジシバリ複合体やハマニガナのような厚い葉を形成することはなかった. これらの結果は, オオジシバリ複合体の葉や走出枝の特徴が, 砂浜環境への適応に関与している可能性を示唆する.

Pollination system of Mucuna thailandica (Fabaceae), a species endemic to Thailand

Kobayashi S, Panha S, Nantarat N, Chaiphichet K, Choosa-nga P, Higashi T, Denda T and Izawa M

Mammal Study ( Mammal Society of Japan ) 50 ( 1 ) 83 - 89 2024年11月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

The pollination modes of plants vary among regions owing to faunal variations; however, knowledge of pollinators in tropical montane Asia is insufficient. Here, we elucidate the pollination system of Mucuna thailandica (Fabaceae), a plant endemic to the montane forest of Thailand. The genus Mucuna exhibits a distinctive pollination mechanism called “explosive opening″. The stamens and pistils of Mucuna flowers are covered by a pair of keel petals, and pollination is only possible when a flower is opened by a pollinator, which exposes stamens and pistil. In bagging experiments, unopened M. thailandica flowers did not bear fruit, indicating that an explosive opening was necessary for successful pollination. Automatic camera surveys showed that squirrels (Callosciurus finlaysonii/erythraeus complex and Dremomys rufigenis), masked palm civets (Paguma larvata), and northern treeshrews (Tupaia belangeri) opened the flowers explosively. Among them, the C. finlaysonii/erythraeus squirrels opened flowers most frequently, and three flowers bore fruits. Thus, C. finlaysonii/erythraeus squirrels may be effective pollinators of M. thailandica. Opening the flowers grants pollinators access to a large volume of nectar with a high sugar concentration as a reward. Our findings suggest that the role of nonflying mammals as pollinators in tropical Asian montane forests may be greater than previously thought.

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Division of labour between dimorphic stamens in Melastoma candidum (melastomataceae): role of stamen strength in the biomechanics of pollination

Hachiman S., Uejo M., Denda T.

Journal of Pollination Ecology ( The Royal Botanical Society of Belgium ) 37 ( 18 ) 284 - 302 2024年11月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

The division of labour hypothesis suggests that plants exhibiting heteranthery utilise different stamen types for distinct purposes; feeding stamens provide pollen as a reward for pollinators, whereas pollinating stamens ensure successful reproduction. However, the biomechanical factors that influence pollinator behaviour in relation to different stamen types remain underexplored. In this study, we investigated Melastoma candidum, a species characterised by dimorphic stamens and poricidal anthers, to elucidate how flower morphology, pollen fertility, and biomechanics of pollinator interactions affect pollination efficiency. We observed the behaviour and stamen preference of multiple bee species visiting the flowers, with a particular focus on the frequency of flower visitation and stigma contact. Among the pollinators studied, Xylocopa flavifrons emerged as the primary pollinator on Okinawajima Island, Japan. Our analysis revealed that while both stamen types exhibit comparable pollen fertility, X. flavifrons preferentially buzzed feeding stamens with the mechanical advantage of pollen collection due to their structural integrity. This preference was further corroborated by biomechanical interactions, wherein the weaker pollinating stamens could not bear the weight of the bee, thereby relegating their function in pollen release. These findings elucidate the significant influence of biomechanical factors on pollinator behaviour and stamen function, providing novel insights into the mechanisms underlying division of labour in plant-pollinator interactions.

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琉球列島におけるオオハマボウの送粉生態

福川優希, 上原綾乃, 傳田哲郎

沖縄生物学会誌 ( 沖縄生物学会 ) 61 13 - 23 2023年03月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Genetic structure of the Liriope muscari polyploid complex and the possibility of human disturbance in Japan

Watanabe K, Yaneshita M, Denda T, Yokota M, Suyama Y, Tsumura Y

Plants 2022年11月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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First record of non-flying mammalian contributors to pollination in a tropical montane forest in Asia

Kobayashi S, Panha S, Seesamut T, Nantarat N. Likhitrakarn N, Denda T, Izawa M

Ecology and Evolution 11 ( 24 ) 17604 - 17608 2021年10月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Flower visitors of Parkia sumatrana (Leguminosae) in northeastern Thailand

SHUN KOBAYASHI, SOMSAK PANHA, JUMLONG PLAKSANOI, SURACHIT WAENGSOTHORN, TETSUO DENDA, MASAKO IZAWA

Tropical Natural History 21 ( 1 ) 200 - 208 2021年04月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Rat- and bat-pollination of Mucuna championii (Fabaceae) in Hong Kong

Kobayashi S.

Plant Species Biology ( Plant Species Biology ) 36 ( 1 ) 84 - 93 2021年01月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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オキナワヤモリによるシマグワの果実の採食例

城野哲平, 傳田哲郎

AKAMATA 29 1 - 4 2020年11月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Effects of different pollinators and herbivores on the fruit set height of the mammal-pollinated tree-climbing vine Mucuna macrocarpa

Kobayashi S.

Journal of Forest Research ( Journal of Forest Research ) 25 ( 5 ) 315 - 321 2020年09月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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琉球列島における希少カメ類の密猟防止対策としての普及啓発活動 ―琉球列島希少カメ類密猟に関するシンポジウム実行委員会―

伊澤雅子, 傳田哲郎, 玉城歩, 小林峻

自然保護助成基金助成成果報告書 ( 公益財団法人自然保護助成基金 ) 29 ( 0 ) 394 - 398 2020年

掲載種別: 研究論文（学術雑誌）

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Analyses of Plastome Sequences Improve Phylogenetic Resolution and Provide New Insight Into the Evolutionary History of Asian Sonerileae/Dissochaeteae.

Zhou Q, Lin CW, Ng WL, Dai J, Denda T, Zhou R, Liu Y

Frontiers in plant science 10 1477 2019年11月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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関連情報を調べる

PubMed

Recircumscription of Bredia and resurrection of Tashiroea (Sonerileae, Melastomataceae)

Zhou Q-J, Dai J-H, Lin C-W, Denda T, Zhou R-C, Liu. Y

PhytoKeys ( PhytoKeys ) 127 ( 2019 ) 121 - 150 2019年07月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

<italic>Bredia</italic> (Melastomataceae) is an Asian genus that extends from central and southern mainland China to Taiwan and the Ryukyu islands. Molecular phylogenetic analyses reveal that the type of <italic>Bredia</italic> is nested in a clade of 20 species, while <italic>Tashiroea</italic>, a genus previously synonymized in <italic>Bredia</italic>, falls in another distantly related clade of 10 species. Our morphological survey shows that the two clades can be distinguished by several diagnostic features including leaf indumentum, texture, leaf surface sculpture under SEM, presence/absence of yellowish uniseriate trichomes, and capsule morphology. Based on molecular and morphological evidence, <italic>Bredia</italic> is recircumscribed and <italic>Tashiroea</italic> is resurrected. Description and a list of species are provided for the two genera with the description of a new species, <italic>T.villosa</italic>.