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Analysis of day-length dependent regulation of Ehd1 expression mediated by a floral repressor Ghd7 in rice

Research Project

Project/Area Number 23687007
Research Category

Grant-in-Aid for Young Scientists (A)

Allocation TypeSingle-year Grants
Research Field Plant molecular biology/Plant physiology
Research InstitutionNational Institute of Agrobiological Sciences

Principal Investigator

ITOH Hironori  独立行政法人農業生物資源研究所, 植物生産生理機能研究ユニット, 研究員 (00466012)

Project Period (FY) 2011-04-01 – 2014-03-31
Project Status Completed (Fiscal Year 2013)
Budget Amount *help
¥24,700,000 (Direct Cost: ¥19,000,000、Indirect Cost: ¥5,700,000)
Fiscal Year 2013: ¥8,060,000 (Direct Cost: ¥6,200,000、Indirect Cost: ¥1,860,000)
Fiscal Year 2012: ¥7,930,000 (Direct Cost: ¥6,100,000、Indirect Cost: ¥1,830,000)
Fiscal Year 2011: ¥8,710,000 (Direct Cost: ¥6,700,000、Indirect Cost: ¥2,010,000)
Keywords光周性 / 限界日長 / フロリゲン / 転写制御 / イネ
Research Abstract

In rice, florigen Hd3a expression is toggled by a 30 minutes difference of day-length reduction. Setting of critical day-length for Hd3a is conferred by precise control of Ehd1 expression. Ghd7 represses Ehd1 to repress Hd3a under long-days. Ghd7 activity is controlled by day-length dependent regulation at both transcriptional and post-transcriptional levels. Contrary, Ehd1 is induced only when blue-light signal coincides with a morning phase set by OsGI, a rice circadian clock component, independently of photoperiods. In here, we identified blue-light signaling pathway required for Ehd1 induction and proposed a model how blue-light signals interact with OsGI to induce Ehd1 expression in the morning. Because blue-light signal is transduced via an ubiquitin-mediated proteolysis, our results indicate that blue-light dependent stabilization of a transacting factor expressed by OsGI can achieve an acute induction of Ehd1 at the morning when Ghd7 repression is released.

Report

(4 results)
  • 2013 Annual Research Report   Final Research Report ( PDF )
  • 2012 Annual Research Report
  • 2011 Annual Research Report
  • Research Products

    (8 results)

All 2014 2013 2012

All Journal Article (2 results) (of which Peer Reviewed: 1 results) Presentation (6 results)

  • [Journal Article] The coincidence of critical day length recognition for florigen gene expression and floral transition under log-day conditions in rice2013

    • Author(s)
      Hironori Itoh, Takeshi Izawa
    • Journal Title

      Molecular Plant, review

      Volume: 6(3) Pages: 635-649

    • Related Report
      2013 Final Research Report
  • [Journal Article] The coincidence of critical day length recognition for florigen gene expression and floral transition under long-day conditions in rice2013

    • Author(s)
      Itoh H, Izawa T
    • Journal Title

      Molecular Plant

      Volume: 6 Issue: 3 Pages: 635-649

    • DOI

      10.1093/mp/sst022

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Presentation] Molecular mechanisms setting critical day length for florigen Hd3a expression in rice. SPP1530 Symposium2014

    • Author(s)
      Hironori Itoh, Takeshi Izawa
    • Organizer
      SPP1530 Symposium, Gentic Variation of Flowering Time Genes and Application for Crop Improvement
    • Place of Presentation
      Bielefeld, Germany
    • Year and Date
      2014-03-26
    • Related Report
      2013 Final Research Report
  • [Presentation] Molecular mechanisms setting critical day length for florigen Hd3a expression in rice2014

    • Author(s)
      Hironori Itoh, Takeshi Izawa
    • Organizer
      SPP1530 Symposium, Genetic Variation of Flowering Time Genes and Applications for Crop Improvement
    • Place of Presentation
      Bielefeld, Germany
    • Related Report
      2013 Annual Research Report
  • [Presentation] Molecular mechanisms of the critical day-length recognition triggering Hd3a expression in rice2013

    • Author(s)
      Hironori Itoh, Takeshi Izawa
    • Organizer
      The 6th Asia & Oceania Conference of Photobiology
    • Place of Presentation
      Sydney, Australia
    • Year and Date
      2013-11-13
    • Related Report
      2013 Annual Research Report 2013 Final Research Report
  • [Presentation] Gynheung An,井津毅(2013)OsELF3-1遺伝子は、何故、イネの花成を制御できるようになったのか?2013

    • Author(s)
      伊藤博紀,田中悠里
    • Organizer
      第124回育種学会
    • Place of Presentation
      鹿児島大学
    • Year and Date
      2013-10-13
    • Related Report
      2013 Final Research Report
  • [Presentation] OsELF3-1遺伝子は、何故、イネの花成を制御できるようになったのか?2013

    • Author(s)
      伊藤博紀、田中悠里、Gynheung A, 井澤毅
    • Organizer
      第124回 日本育種学会
    • Place of Presentation
      鹿児島大学、日本
    • Related Report
      2013 Annual Research Report
  • [Presentation] イネのフロリゲンHd3a遺伝子転写制御におけるOsELF3の役割2012

    • Author(s)
      伊藤博紀, Gynheung An,井津毅
    • Organizer
      第53回日本植物生理学会年会
    • Place of Presentation
      京都産業大学
    • Year and Date
      2012-03-18
    • Related Report
      2013 Final Research Report 2011 Annual Research Report

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Published: 2011-04-06   Modified: 2019-07-29  

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