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Study on mechanism suppressing starch biosynthesis by plastidial folate

Research Project

Project/Area Number 19K06731
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 44030:Plant molecular biology and physiology-related
Research InstitutionNagahama Institute of Bio-Science and Technology

Principal Investigator

Hayashi Makoto  長浜バイオ大学, バイオサイエンス学部, 教授 (50212155)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords葉酸 / デンプン / プラスチド / エチオプラスト / 葉酸代謝拮抗剤 / 抗菌剤 / 除草剤 / デンプン合成 / 光合成 / 葉緑体 / アミロプラスト / でんぷん
Outline of Research at the Start

プラスチドはアミロプラストなどのデンプン蓄積型プラスチドと、エチオプラストなどのデンプン非蓄積型プラスチドに大別できる。本研究の目的は、デンプン非蓄積型プラスチドがデンプンを蓄積しない機構の解明にある。
申請者は、エチオプラストにデンプンを蓄積する変異体の単離に成功した。変異体の解析から、デンプン非蓄積型プラスチドでは、葉酸によってデンプン合成が抑制されていることを明らかにした。しかし、葉酸の詳しい作用機作は解明できていない。そこで、葉酸の制御を受けるデンプン合成関連遺伝子やタンパク質の網羅的同定とその機能解析を計画した。
得られる知見は、デンプン増産に向けた技術への応用が期待できる。

Outline of Final Research Achievements

Previously, the applicants proposed model that folic acid inhibits starch accumulation in non-starch-accumulating plastids. To examine this model, we performed several experiments, and obtained following results.
(1) Thirteen FU-resistant mutants were obtained. Mutated gene in two of them was identified. Function of these genes has not demonstrated yet. We are now analyzing the function by demonstrating phenotype of these mutants in detail. Several adenine-resistant and D8-resistant mutants were also isolated and characterized. (2) Two compounds that had ability to induce starch accumulation in non-starch-accumulating plastids were identified. One of them (D8) seemed to be an antifolate. Manuscript describing these results are being prepared for publication. To isolate protein that binds to D8, An affinity carrier containing D8 is under synthesis.

Academic Significance and Societal Importance of the Research Achievements

デンプンは食料やバイオ燃料の原料として重要である。デンプンは光合成の最終産物としてアミロプラストや葉緑体に蓄積する。一方、これら以外のプラスチドでは葉酸がデンプンの蓄積を抑制している。本研究によって同定された遺伝子は葉酸によるデンプン蓄積抑制機構に関わると考えられる。より多くの関連遺伝子が同定され、その機能が明らかになることで、葉酸によるデンプン蓄積抑制機構の理解が進むとともに、植物のデンプン生産性向上に向けた技術基盤の開発につながるものと期待される。

Report

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

    (8 results)

All 2021 2019 Other

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

  • [Journal Article] GFS9 Affects Piecemeal Autophagy of Plastids in Young Seedlings of Arabidopsis thaliana.2021

    • Author(s)
      Ishida, H., Okashita, Y., Ishida H., Hayashi, M., Izumi, M., Amane Makino, A., Bhuiyan, N.H. and Van Wijk, K.J.
    • Journal Title

      Plant Cell Physiol.

      Volume: 62 Issue: 9 Pages: 1372-1386

    • DOI

      10.1093/pcp/pcab084

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Kanai, M., Yamada, T., Hayashi, M., Mano, S., and Nishimura, M. (2019). Soybean (Glycine max L.) triacylglycerol lipase GmSDP1 regulates the quality and quantity of seed oil.2019

    • Author(s)
      Kanai, M., Yamada, T., Hayashi, M., Mano, S., and Nishimura, M.
    • Journal Title

      Scientific Reports

      Volume: 9 Issue: 1 Pages: 8924-8924

    • DOI

      10.1038/s41598-019-45331-8

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Sucrose starvation induces microautophagy in plant root cells2019

    • Author(s)
      Goto-Yamada, S., Oikawa, K., Bizan, J., Shigenobu, S., Yamaguchi, K., Mano, S., Hayashi, M., Ueda, H., Hara-Nishimura, I., Nishimura, M., and Yamada, K.
    • Journal Title

      Frontiers in Plant Science

      Volume: 10 Pages: 1604-1604

    • DOI

      10.3389/fpls.2019.01604

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Functional analysis of glycosyltransferase SEC in Arabidopsis thaliana de-differentiation and shoot regeneration processes.2019

    • Author(s)
      Kameyama, T., Nakagawa, U., Kamemura, K., Hayashi, M. and Imamura, A.
    • Organizer
      第60回日本植物生理学会年会
    • Related Report
      2019 Research-status Report
  • [Presentation] GFS9 has a role in piecemeal autophagy of plastids in dark-grown seedlings of Arabidopsis.2019

    • Author(s)
      Ishida, H., Ishida, H., Izumi, M., Hayashi, M., Makino, A. and van Wijk, K.
    • Organizer
      第60回日本植物生理学会年会
    • Related Report
      2019 Research-status Report
  • [Remarks] 植物環境生化学研究室

    • URL

      http://b-lab.nagahama-i-bio.ac.jp/?page_id=72

    • Related Report
      2021 Annual Research Report
  • [Remarks] 植物環境細胞生化学研究室

    • URL

      http://b-lab.nagahama-i-bio.ac.jp/?page_id=72

    • Related Report
      2020 Research-status Report
  • [Remarks] 研究内容の概要

    • URL

      http://b-lab.nagahama-i-bio.ac.jp/?page_id=175

    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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