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Evolutionary processes of roots from subterranean stems in lycophytes

Research Project

Project/Area Number 21H02553
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 45030:Biodiversity and systematics-related
Research InstitutionHokkaido University (2022-2023)
Osaka City University (2021)

Principal Investigator

Yamada Toshihiro  北海道大学, 理学研究院, 教授 (70392537)

Co-Investigator(Kenkyū-buntansha) 中村 英人  北海道大学, 理学研究院, 助教 (00785123)
小松 俊文  熊本大学, 大学院先端科学研究部(理), 教授 (40336201)
藤浪 理恵子  京都教育大学, 教育学部, 准教授 (40580725)
LEGRAND Julien  静岡大学, 理学部, 助教 (60737534)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥14,560,000 (Direct Cost: ¥11,200,000、Indirect Cost: ¥3,360,000)
Fiscal Year 2023: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2022: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
Keywords小葉類 / ヒカゲノカズラ / 根の起源 / 根 / 担根体 / 光合成 / デボン紀 / シルル紀 / 根冠 / 根圏
Outline of Research at the Start

植物はデボン紀に競って根を進化させたが,根の進化過程は長らく不明だった。本研究では,地下茎でオーキシン濃度が増加した結果,根冠を持つ根が起源したという仮説を,生理実験と遺伝子発現解析によって検証する。一方,現生植物の根には水や養分の吸収に不可欠な根圏が形成されている。本研究ではシルル紀のヒカゲノカズラ科の地下茎が“根圏”を持っていたことを分子化石から証明する。本研究の結果,植物学の積年の難問「根の起源」が初めて解明される。

Outline of Final Research Achievements

To test the hypothesis that the root in lycophytes is a stem that acquires a root cap, we observed root development in the extant Lycopodium clavatum. Our observations revealed that the first root with chloroplasts emerges near a branching point of the stem. This primary root branches multiple times to form third- or fourth-order roots, which exhibit distinct meristematic characteristics and cell division dynamics compared to the primary root. These findings suggest that the first root is homologous to the stem. Furthermore, we searched for the oldest root fossils lacking a root cap from the Silurian to the Devonian in northern Vietnam and Japan. We discovered the oldest plant fossils in Asia in Vietnam, as well as the oldest ones in Japan. However, we did not find the oldest root.

Academic Significance and Societal Importance of the Research Achievements

すべての植物は根を持つが、根がどのように起源したのかは長らく謎だった。私たちは、植物の中で最初に根を獲得した小葉類に着目し、それら根が地下茎と相同であることを初めて明らかにした。また、ヒカゲノカズラの根は分枝するにつれ、茎的性質を徐々に失い、根としての性質を確立することを明らかにした。つまり、小葉類は、他の植物とは異なり、根と茎との中間的器官を保持していることになる。この成果は、現生小葉類が他の植物とは異なる体制を持つことを示す点で、驚くべきものである。一方、日本最古の植物化石群の発見は研究の副産物的なものであるが、日本の植物史の理解に大きく貢献した。

Report

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

    (17 results)

All 2024 2023 2022 2021 Other

All Int'l Joint Research (8 results) Journal Article (5 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 5 results,  Open Access: 1 results) Presentation (4 results) (of which Int'l Joint Research: 2 results)

  • [Int'l Joint Research] アルアズハル大学(エジプト)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] ベトナム地質科学鉱産資源研究所/ベトナム国立科学博物館(ベトナム)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] ベトナム地質科学鉱産資源研究 所/ベトナム国立科学博物館(ベトナム)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] レスター大学(英国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] ゲント大学(ベルギー)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] ベトナム地質科学鉱産資源研究所/ベトナム国立科学博物館(ベトナム)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] レスター大学(英国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] ゲント大学(ベルギー)

    • Related Report
      2021 Annual Research Report
  • [Journal Article] Early Land Plant Spore Assemblage from the Devonian Nakazato Formation of the South Kitakami Belt, Northeast Japan2024

    • Author(s)
      Maher Ahmed、Legrand Julien、Yamada Toshihiro、Komatsu Toshifumi
    • Journal Title

      Paleontological Research

      Volume: 28 Issue: 4 Pages: 1-10

    • DOI

      10.2517/pr230018

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Ostracods from the Upper Silurian Si Ka Formation, Northern Vietnam, and Their Paleobiogeographical Significance2023

    • Author(s)
      Williams Mark、Komatsu Toshifumi、Nguyen Phong Duc、Siveter David J.、McGairy Anna、Bush Harrison、Goodall Robert H.、Harvey Thomas H. P.、Stocker Christopher P.、Legrand Julien、Yamada Toshihiro、Miller C. Giles
    • Journal Title

      Paleontological Research

      Volume: 27 Issue: 3 Pages: 210032-210032

    • DOI

      10.2517/pr210032

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Shared body plans of lycophytes inferred from root formation of Lycopodium clavatum2022

    • Author(s)
      Ito Yuki、Fujinami Rieko、Imaichi Ryoko、Yamada Toshihiro
    • Journal Title

      Frontiers in Ecology and Evolution

      Volume: 10 Pages: 1-1

    • DOI

      10.3389/fevo.2022.930167

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Implications of an early land plant spore assemblage for the late Silurian age of the Si Ka Formation, northern Vietnam2021

    • Author(s)
      Legrand Julien、Yamada Toshihiro、Komatsu Toshifumi、Williams Mark、Harvey Tom、De Backer Tim、Vandenbroucke Thijs R.A.、Nguyen Phong Duc、Doan Hung Dinh、Nguyen Hung Ba
    • Journal Title

      Annales de Pal?ontologie

      Volume: 107 Issue: 3 Pages: 102486-102486

    • DOI

      10.1016/j.annpal.2021.102486

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Ostracods had colonized estuaries by the late Silurian2021

    • Author(s)
      McGairy Anna、Komatsu Toshifumi、Williams Mark、Harvey Thomas H. P.、Miller C. Giles、Nguyen Phong Duc、Legrand Julien、Yamada Toshihiro、Siveter David J.、Bush Harrison、Stocker Christopher P.
    • Journal Title

      Biology Letters

      Volume: 17 Issue: 12 Pages: 20210403-20210403

    • DOI

      10.1098/rsbl.2021.0403

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Evolution of subterranean organs in lycophytes based on Lycopodium clavatum root characters2023

    • Author(s)
      Yuki Ito, Rieko Fujinami, Ryoko Imaichi, Toshihiro Yamada
    • Organizer
      2nd Asian Palaeontological Congress, TOKYO
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Oldest terrestrial flora of Japan obtained from the Devonian Nakazato Formation of the South Kitakami Belt, Northeast Japan2023

    • Author(s)
      Ahmed Maher, Toshifumi Komatsu, Toshihiro Yamada, Julien Legrand
    • Organizer
      2nd Asian Palaeontological Congress, TOKYO
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 根の形成位置から考える小葉類の根と根形成器官の進化2022

    • Author(s)
      伊藤雄氣,藤浪理恵子,山田敏弘
    • Organizer
      日本植物分類学会第21回大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 初期植物の微化石群集から解明する北部ベトナムSi Ka層の地質年代と古環境2021

    • Author(s)
      Julien Legrand,山田敏弘,小松俊文,Mark Williams,Tom Harvey,Tim De Backer,Thijs R.A. Vandenbroucke,Phong Duc Nguyen,Hung Dinh Doan,Hung Ba Nguyen
    • Organizer
      日本古生物学会2021年年会
    • Related Report
      2021 Annual Research Report

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

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