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Genetic analysis of panicle branching regulators from wild rice species

Research Project

Project/Area Number 19K05980
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 39010:Science in plant genetics and breeding-related
Research InstitutionNational Institute of Genetics

Principal Investigator

Tsuda Katsutoshi  国立遺伝学研究所, 遺伝形質研究系, 助教 (30756408)

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: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2019: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords野生イネ / 穂分枝制御 / 生存戦略 / 穂分枝形成 / 成長・発生遺伝 / 穂分枝 / 栽培化
Outline of Research at the Start

花序の分枝数は種子の収量に直結する重要形質である。栽培イネ Oryza sativa は祖先の野生イネ O. rufipogon に比べ穂分枝数が多く、栽培化の過程で種子数を増大させた主要因と考えられるが、どのような自然変異に起因して分枝数が増えたのかは不明である。研究代表者は、野生イネが強力な分枝抑制因子Uniaxial (Uni)を持つことを見出した。本計画では、野生-栽培種間でUniに生じた自然変異を同定し、栽培化前のイネが持っていた分枝制御メカニズムを明らかにするとともに、その機能変化と栽培化との関連を検証する。本研究から、分枝制御メカニズムの理解を核とした、作物育種・発生・進化に関わる重要な知見が得られる。

Outline of Final Research Achievements

Inflorescence branching is an important factor that determines crop yield. Domesticated rice (Oryza sativa) has more panicle branches compared to its wild ancestor O. rufipogon. However, diversity in the regulation of inflorescence branching among wild species remains elusive. Here we focused on Uniaxial (Ux), a panicle branching repressor found in O. rufipogon. We cloned Ux and revealed its distribution among the wild rice population. We also showed that O. rufipogon has Suppressor of Uniaxial (Su), which is a dominant factor that completely suppresses the Ux phenotype.

Academic Significance and Societal Importance of the Research Achievements

野生植物の繁殖戦略において次世代に残す種子と自身の植物体維持の間で資源分配調節を行うことは重要である。本研究では野生イネが独自に持つ穂分枝抑制因子Uxを同定した。Uxは特定の野生イネ集団内に分布する傾向があったことから、それらの自生地および生存戦略とUxを介した資源分配が密接に関連することが考えられた。また、野生イネはUxの作用を完全に打ち消す因子Suも持つことが明らかとなり、資源分配を巧妙に調節するための仕組みが備わっている可能性が見えてきた。

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

    (6 results)

All 2022 2021 2020

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

  • [Journal Article] Comparison of constitutive promoter activities and development of maize <i>ubiquitin</i> promoter- and Gateway-based binary vectors for rice2022

    • Author(s)
      Katsutoshi Tsuda, Toshiya Suzuki, Manaki Mimura and Ken-Ichi Nonomura
    • Journal Title

      Plant Biotechnology

      Volume: 39 Issue: 2 Pages: 139-146

    • DOI

      10.5511/plantbiotechnology.22.0120a

    • ISSN
      1342-4580, 1347-6114
    • Year and Date
      2022-06-25
    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] OryzaGenome2.1: Database of Diverse Genotypes in Wild Oryza Species2021

    • Author(s)
      Kajiya-Kanegae et al.
    • Journal Title

      Rice

      Volume: 14 Issue: 1 Pages: 24-24

    • DOI

      10.1186/s12284-021-00468-x

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Collection, preservation and distribution of Oryza genetic resources by the National Bioresource Project RICE (NBRP-RICE)2021

    • Author(s)
      Sato et al.
    • Journal Title

      Breeding Science

      Volume: -

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Agrobacterium-Mediated Genetic Transformation of Wild Oryza Species Using Immature Embryos2020

    • Author(s)
      Shimizu-Sato Sae et al.
    • Journal Title

      Rice

      Volume: 13 Issue: 1 Pages: 33-33

    • DOI

      10.1186/s12284-020-00394-4

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] ゲノム情報とゲノム編集が可能にする野生イネ遺伝資源の新たな利活用2022

    • Author(s)
      津田勝利
    • Organizer
      日本植物生理学会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Genetic analysis of panicle branch regulators from a rice ancestor, Oryza rufipogon2021

    • Author(s)
      Katsutoshi Tsuda
    • Organizer
      日本植物学会
    • Related Report
      2021 Research-status Report

URL: 

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

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