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Studies on the regulation of elongation growth by gibberellins

Research Project

Project/Area Number 14340249
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 植物生理
Research InstitutionHIR0SHIMA UNIVERSITY

Principal Investigator

TAKAHASHI Yohsuke  Hiroshima University, Graduate School of Science, Profeesor, 大学院・理学研究科, 教授 (90183855)

Project Period (FY) 2002 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥14,600,000 (Direct Cost: ¥14,600,000)
Fiscal Year 2005: ¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 2004: ¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2003: ¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2002: ¥4,600,000 (Direct Cost: ¥4,600,000)
KeywordsGibberellin / Transcription factor / 14-3-3 / Intracellular localization / CDPK / Phosphorylation / キナーゼ
Research Abstract

Gibberellins (GAs) are essential regulators of many aspects of plant development, including seed germination, stem elongation, flower induction, and anther development. Both endogenous developmental programs and environmental stimuli affect the expression of these enzymes. Therefore, elucidating the transcriptional regulation of GA biosynthetic enzymes is crucial to identify the molecular mechanisms involved in plant development and to understand how these mechanisms help plants adapt to changes in their environment. RSG is a tobacco (Nicotiana tabacum) transcriptional activator with a basic Leu zipper domain that regulates endogenous amounts of GAs by the control of a GA biosynthetic enzyme. The 14-3-3 signaling proteins have been suggested to suppress RSG by sequestering it in the cytoplasm. We found that GA levels regulate the intracellular localization of RSG. RSG translocated into the nucleus in response to a reduction in GA levels. GA treatment could reverse this nuclear accumulation. The GA-induced disappearance of RSG-green fluorescent protein from the nucleus did not depend on protein degradation. By contrast, the mutant RSG (S114A) that could not bind to 14-3-3 continued to be localized predominantly in the nucleus after GA application. Analysis of the mRNA levels of GA biosynthetic genes showed that the feedback regulation of the GA 20-oxidase gene was inhibited in transgenic plants expressing a dominant negative form of RSG. Our results suggest that RSG is negatively modulated by GAs by 14-3-3 binding and might be involved in GA homeostasis.

Report

(5 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • Research Products

    (16 results)

All 2005 2004 2003 Other

All Journal Article (12 results) Publications (4 results)

  • [Journal Article] ジベレリン内生量による転写調節因子の機能制御2005

    • Author(s)
      石田さらみ
    • Journal Title

      生物物理 45

      Pages: 264-267

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Functional regulation of a plant transcription factor by gibberellin levels.2005

    • Author(s)
      Ishida, S.
    • Journal Title

      Seibutsu Butsuri 45

      Pages: 264-267

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] ジベレリン内生量による転写調節因子の機能制御2005

    • Author(s)
      石田さらみ, 高橋陽介
    • Journal Title

      生物物理 (印刷中)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Involvement of 14-3-3 binding in the functional regulation of RSG by gibberellins.2004

    • Author(s)
      Ishida, S.
    • Journal Title

      Plant Cell 16

      Pages: 2641-2651

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Identification and characterization of germin-like protein gene family of a moss, Physcomitrella patens.2004

    • Author(s)
      Nakata, M.
    • Journal Title

      Plant Mol. Biol. 56

      Pages: 381-395

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Involvement of 14-3-3 binding in the functional regulation of RSG by gibberellins.2004

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

      Plant Cell 16

      Pages: 2641-2651

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary 2004 Annual Research Report
  • [Journal Article] Identification and characterization of germin-like protein gene family of a moss, Physcomitrella patens.2004

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

      Plant Mol. Biol. 56

      Pages: 381-395

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Identification and characterization of germin-like protein gene family of a moss, Physcomitrella patens.2004

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

      Plant Mol.Biol. 56

      Pages: 381-395

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Involvement of RSG and 14-3-3 proteins in the transcriptional regulation of a GA biosynthetic gene.2003

    • Author(s)
      Takahashi, Y.
    • Journal Title

      J Plant Growth Regul. 22

      Pages: 195-204

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] 茎の形成2003

    • Author(s)
      石田さらみ
    • Journal Title

      蛋白質核酸酵素 47

      Pages: 1581-1586

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Involvement of RSG and 14-3-3 proteins in the transcriptional regulation of a GA biosynthetic gene.2003

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

      J. Plant Growth Regul. 22

      Pages: 195-204

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Regulation of stem elongation.2003

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

      P.N.E. 47

      Pages: 1581-1586

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Publications] Takahashi et al.: "Involvement of RSG and 14-3-3 proteins in the transcriptional regulation of a GA biosynthetic gene"J.Plant Growth Regul.. 22. 195-204 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Takahashi et al.: "Involvement of RSG and 14-3-3 proteins in the transcriptional regulation of a GA biosynthetic gene"J. Plant Growth Regul.. (in press). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] Ishida et al.: "Regulation of endogenous amounts of gibberellins by a bZIP transcription factor RSG and 14-3-3 proteins"Research Signopost. (in press). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 石田さらみ, 高橋陽介: "茎の形成"蛋白質核酸酵素. 47. 1581-1586 (2003)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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