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How did plants requiring symbiotic fungi colonize oceanic islands?

Research Project

Project/Area Number 21K06306
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 45030:Biodiversity and systematics-related
Research InstitutionSaga University

Principal Investigator

Ogura-Tsujita Yuki  佐賀大学, 農学部, 准教授 (80522523)

Co-Investigator(Kenkyū-buntansha) 遊川 知久  独立行政法人国立科学博物館, 植物研究部, グループ長 (50280524)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords菌根共生 / 海洋島 / ラン科植物 / 種子発芽 / ラン科 / 系統分類 / 菌類
Outline of Research at the Start

火山活動や隆起により誕生した海洋島では、海を渡ってたどり着いた植物が固有の植物相を形成する。しかし、陸上植物の中には、特定の共生菌パートナーがいる場所でしか定着できない種類が存在する。このような特性は、一見分布拡大には不利に思えるが、実際は海洋島にも自生が見られる。一体どうやって定着したのだろうか?本研究は、このような特性をもつ植物が、海洋島への定着を成し得たメカニズムを菌共生の視点から探るため、近年新たに小笠原諸島の海洋島へ定着したトサカメオトランの菌共生を解明する。

Outline of Final Research Achievements

Orchids require orchid mycorrhizal fungi (OMF) to germinate, and thus OMF associations play a key role in the expansion of orchid distributions. Geodorum densiflorum is widely distributed in tropical and sub-tropical Asia and Oceania. In Japan, this species was distributed in the Ryukyu Islands, but has recently been found in the Bonin Islands. We compared the OMF community of G. densiflorum between Ryukyu and Bonin Islands populations for understanding the mycorrhizal association involved in the recent expansion to the Bonin Islands. The common OMF fungi, Tulasnellaceae, were dominant in both islands. Phylogenetic analysis revealed that main fungal partners showed world-wide distributions. These results suggest that such wide distributing fungi allow the expansion of G. densiflorum to the Bonin Islands.

Academic Significance and Societal Importance of the Research Achievements

海洋島では風や波、鳥などで偶然運ばれた種で生物相が形成され、独自の生態系が見られる。植物が海洋島へ進出する戦略は、これまで風や動物による種子散布様式が着目されてきた。しかし、生物間相互作用も重要な定着因子となっている可能性がある。本研究は、特定の共生パートナーが定着に必須である植物が、海洋島への定着を成し得たメカニズムを明らかにし、海洋島の生物相形成の理解に大きく貢献した。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (6 results)

All 2024 2023 2022 Other

All Int'l Joint Research (1 results) Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (3 results) (of which Int'l Joint Research: 2 results)

  • [Int'l Joint Research] グアム大学(米国)

    • Related Report
      2023 Annual Research Report
  • [Journal Article] The epiphytic orchid Vanda falcata is predominantly associated with a single Tulasnellaceae fungus in adulthood, and Ceratobasidiaceae fungi strongly induce its seed germination in vitro2023

    • Author(s)
      Rammitsu Kento、Yamamoto Nao、Chamara R. M. S. Ruwan、Minobe Mutsumi、Kinoshita Akihiko、Kotaka Nobuhiko、Ogura‐Tsujita Yuki
    • Journal Title

      Plant Species Biology

      Volume: 38 Issue: 6 Pages: 306-318

    • DOI

      10.1111/1442-1984.12432

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Mycorrhizal specificity differences in epiphytic habitat: three epiphytic orchids harbor distinct ecological and physiological specificity2023

    • Author(s)
      Rammitsu, K., M. Goto, Y. Yamashita, T. Yukawa and Y. Ogura-Tsujita
    • Journal Title

      Journal of Plant Research

      Volume: 136 Issue: 6 Pages: 803-816

    • DOI

      10.1007/s10265-023-01486-0

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Presentation] Mycorrhizal Fungi Involved in the Recent Expansion of Geodorum densiflorum in the Bonin Islands, Japan2024

    • Author(s)
      Yoshimi Maehara, Akihiko Kinoshita, Kento Rammitsu, Atsushi Abe, Tadashi Kajita, Dairo Kawaguchi, Akitsugu Mukai, Tomohisa Yukawa, Yuki Ogura-Tsujita
    • Organizer
      23rd World Orchid Conference
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Biodiversity and Conservation of Japanese Native Orchids2024

    • Author(s)
      Tomohisa Yukawa, Chie Tsutsumi, Yumi Yamashita, Kazuhiro Suzuki and Yuki Ogura-Tsujita
    • Organizer
      23rd World Orchid Conference
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] トサカメオトランの分布拡大に関与した菌根菌の解明2022

    • Author(s)
      前原良美・木下晃・蘭光健人・阿部篤志・梶田忠・川口大朗・向哲嗣・遊川知久・辻田有紀
    • Organizer
      日本菌学会第66回大会
    • Related Report
      2022 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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