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Elucidation of the molecular mechanism for releasing pollen cells from quiescent state

Research Project

Project/Area Number 20K21417
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 44:Biology at cellular to organismal levels, and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

Fujii Sota  東京大学, 大学院農学生命科学研究科(農学部), 准教授 (90716713)

Project Period (FY) 2020-07-30 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2021: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2020: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywords花粉 / 休眠 / 発芽 / 脂質体 / 小胞体
Outline of Research at the Start

生物はエネルギーを消費しない休眠状態と、エネルギーを消費する成長状態を使い分け多様な環境に適応している.植物の花粉は雄性配偶子であるが、水分が20%以下に制限され仮死状態にある.仮死状態で受粉したのち数分で吸水が始まり、わずか15分後には生物界で最も高速とも言われる先端成長状態へと移行する.本研究では花粉に大量に存在する脂肪滴がこのような状態遷移を可能にしていると仮説立てその機能を検証する.

Outline of Final Research Achievements

This study analyzed the mechanism by which pollen cells rapidly transition from a quiescent state to a state of high-speed tip growth, with a focus on a molecule called VPS13a in plants. It was revealed that VPS13a plays an important role in the regulation of adhesion and release between intracellular organelles such as the endoplasmic reticulum and lipid droplets (LD). In addition, it was found that VPS13a co-localizes with proteins that make up secretory vesicles, and that the absence of VPS13a affects secretion in pollen tubes.

Academic Significance and Societal Importance of the Research Achievements

本研究により、植物のVPS13aの生化学的な機能が初めて明らかとなった.VPS13は真核生物において普遍的に保存されており、様々な細胞機能をもつことが報告されてきた.一方で、本研究ではVPS13aが初めてエキソサイトーシスに関わることを示しており、細胞分泌と花粉管成長との間を取り持つ鍵分子であることを明らかにした.VPS13は真核生物で保存されているうちで最も大きなタンパク質のひとつであり未知が多く、本研究の基礎細胞生物学的な価値が期待される.

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (8 results)

All 2023 2022 2021

All Journal Article (1 results) (of which Open Access: 1 results) Presentation (7 results) (of which Int'l Joint Research: 1 results,  Invited: 2 results)

  • [Journal Article] A land plant specific VPS13 mediates polarized vesicle trafficking in germinating pollen2022

    • Author(s)
      Tangpranomkorn Surachat、Igarashi Motoko、Ishizuna Fumiko、Kato Yoshinobu、Suzuki Takamasa、Fujii Sota、Takayama Seiji
    • Journal Title

      biorxiv

      Volume: - Pages: 1-40

    • DOI

      10.1101/2022.11.01.514778

    • Related Report
      2022 Annual Research Report
    • Open Access
  • [Presentation] The plant-specific Arabidopsis VPS13a mediates polarized vesicle trafficking during pollen germination.2023

    • Author(s)
      Surachat Tangpranomkorn, Motoko Igarashi, Fumiko Ishizuna, Yoshinobu Kato, Takamasa Suzuki, Sota Fujii, Seiji Takayama
    • Organizer
      第64回日本植物生理学会
    • Related Report
      2022 Annual Research Report
  • [Presentation] The plant specific Arabidopsis VPS13a mediates pollen grain polarization during pollen germination.2022

    • Author(s)
      Surachat Tangpranomkorn, Motoko Igarashi, Fumiko Ishizuna, Yoshinobu Kato, Takamasa Suzuki, Sota Fujii, Seiji Takayama.
    • Organizer
      第45回日本分子生物学会
    • Related Report
      2022 Annual Research Report
  • [Presentation] アブラナ科植物の異種花粉排除に 関わる雌蕊 SPRI1 タンパク質の機能解析2022

    • Author(s)
      Yoshinobu Kato, Shota Ishida, Yuka Kimura, Shun Tadokoro, Seiji Takayama, Sota Fujii
    • Organizer
      第63回日本植物生理学会
    • Related Report
      2021 Research-status Report
  • [Presentation] 植物生殖において異種間受精を防ぐ分子メカニズム2021

    • Author(s)
      藤井壮太
    • Organizer
      第23回日本進化学会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] 植物生殖における異種間細胞相互作用の分子メカニズム2021

    • Author(s)
      藤井壮太
    • Organizer
      第44回日本分子生物学会
    • Related Report
      2021 Research-status Report
  • [Presentation] Molecular rejection mechanisms of pollen in pistils2021

    • Author(s)
      Sota Fujii
    • Organizer
      International Conference on Arabidopsis Research 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 花粉発芽におけるシロイヌナズナVPS13 タンパク質の分子機能について2021

    • Author(s)
      藤井壮太
    • Organizer
      植物生理学会
    • Related Report
      2020 Research-status Report

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Published: 2020-08-03   Modified: 2024-01-30  

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