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Elucidation of the molecular mechanism of symbiotic incompatibility via type III secretion system and plant immunity

Research Project

Project/Area Number 19K05760
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 38020:Applied microbiology-related
Research InstitutionObihiro University of Agriculture and Veterinary Medicine (2020-2022)
Tohoku University (2019)

Principal Investigator

Sugawara Masayuki  帯広畜産大学, 畜産学部, 准教授 (90742776)

Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2020: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords根粒菌 / 3型タンパク質分泌機構 / エフェクター / 共生不和合性 / ダイズ / 共生 / 植物免疫
Outline of Research at the Start

本研究は、マメ科植物と根粒菌の宿主特異性を引き起こす分子機構を解明し、ダイズの安定多収へ向けた技術開発を目指すものである。私たちは特定の遺伝型(Rj2)のダイズが一部の根粒菌株とは共生をしない現象(共生不和合性)に着目し、その原因が根粒菌3型分泌エフェクタータンパク質を介した免疫応答であることを証明した。本課題では共生不和合性における分子機構の理解を深めるため、植物根毛細胞によるエフェクターの認識・応答機構を遺伝学・生化学的に解明する。加えて、ダイズ根粒菌資源の整備とそのエフェクターの同定、及びダイズリソースに対する特異性の解明により、共生不和合性の知見に基づくダイズ安定多収の基盤を確立する。

Outline of Final Research Achievements

In order to elucidate the molecular mechanism of symbiotic incompatibility with leguminous plants mediated by rhizobial type III secretory effector NopP, we investigated changes in gene expression in soybean roots induced by incompatible NopP. As a result, the genes involved in oxidative stress, cell wall construction and maintenance, and multiple pathogenic responses were significantly upregulated. In addition, this study revealed that the type III secretion system of soybean rhizobia is involved in the symbiotic incompatibility with several species of the Desmodieae, including Lespedeza cuneata. On the other hand, it was suggested that unknown incompatibility factors other than the type III secretion system are involved in the incompatibility of rhizobia isolated from Lespedeza nodules to soybean.

Academic Significance and Societal Importance of the Research Achievements

根粒菌とマメ科植物の共生相互作用において、3型分泌エフェクターと植物免疫系を介して特異性が決定される例が本研究期間内において続々と報告され、根粒菌エフェクターによる宿主特異性の決定が進化の過程で広く確立してきたことが窺える。したがって、本研究の成果は根粒菌と植物の共進化を紐解く重要な手がかりとなり学術的な意義は高い。またマメ科作物の生産性向上と環境負荷低減に寄与可能な技術の構築において、共生不和合性を応用することで優良な根粒菌の競合性を高めることが期待され、本成果は社会的にも有意義な知見を与えるものであると考えられる。

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (5 results)

All 2022 2021 2019

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

  • [Journal Article] Symbiotic incompatibility between soybean and Bradyrhizobium arises from one amino acid determinant in soybean Rj2 protein2019

    • Author(s)
      Sugawara Masayuki、Umehara Yosuke、Kaga Akito、Hayashi Masaki、Ishimoto Masao、Sato Shusei、Mitsui Hisayuki、Minamisawa Kiwamu
    • Journal Title

      PLOS ONE

      Volume: 14 Issue: 9 Pages: e0222469-e0222469

    • DOI

      10.1371/journal.pone.0222469

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Symbiotic incompatibility between soybean and Bradyrhizobium via effector-triggered immunity2022

    • Author(s)
      Maasayuki Sugawara
    • Organizer
      2022 International Symposium and Annual Meeting of the KSABC
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] 根粒菌エフェクタータンパク質により誘導されるダイズとの共生不和合性2021

    • Author(s)
      菅原雅之
    • Organizer
      農芸化学会北海道支部第1回学術講演会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Symbiotic incompatibility via effector-triggered immunity between soybean Rj2-genotype and bradyrhizobial NopP: Rj2 allele distribution in soybean resources.2019

    • Author(s)
      Masayuki Sugawara, Yosuke Umehara, Satoko Takahashi, Akito Kaga, Masaki Hayashi, Masao Ishimoto, Shusei Sato, Hisayuki Mitsui, Kiwamu Minamisawa
    • Organizer
      5th Asian Conference on Plant-Microbe Symbiosis and Nitrogen Fixation.
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Identification of the host specificity determinant of bradyrhizobia based on genomic comparison2019

    • Author(s)
      Masayuki Sugawara, Yuki Konno, Yoshiyuki Ohtsubo, Masaya Kajiwara, Tomoyuki Nemoto, Hisayuki Mitsui, Kiwamu Minamisawa
    • Organizer
      21st International Congress on Nitrogen Fixation
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2024-01-30  

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