Analysis of day-length dependent regulation of Ehd1 expression mediated by a floral repressor Ghd7 in rice
| Project/Area Number |
23687007
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Plant molecular biology/Plant physiology
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| Research Institution | National Institute of Agrobiological Sciences |
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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)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| 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)
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| Keywords | 光周性 / 限界日長 / フロリゲン / 転写制御 / イネ |
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| 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.
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Report
(4 results)
Research Products
(8 results)
