| Project/Area Number |
23658018
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Crop science/Weed science
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| Research Institution | Fukui Prefectural University |
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Principal Investigator |
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| Project Period (FY) |
2011 – 2013
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2012: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2011: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | 植物ホルモン / 低酸素環境適応 / アブシジン酸 / 代謝不活性化経路 / 湿生植物 / ヒエ属 / 嫌気発芽 / 生活史進化 / 嫌気応答 / 種子発芽 / アブシシン酸 / 代謝不活性化 / アブシジン酸代謝不活性化 |
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| Research Abstract |
Echinochloa plants have differentiated upland and paddy ecotypes. In paddy ecotype seeds, abscisic acid (ABA) decreased under both anaerobic and aerobic conditions, in association with their germination. ABA is degraded via an oxidation pathway and/or a glucose conjugation pathway in which oxygen is not required for its reaction. The ABA glucose conjugates increased in the germinating paddy ecotype seeds. In contrast, dihydrophaseic acid, a major catabolite in the oxidation pathway, accumulated in the upland ecotype seeds. Conclusively, it appeared that seeds of the upland ecotype decrease endogenous ABA by the oxidative degradation and those of the paddy ecotype by the conjugative degradation. Similar phenomena, shown in the Echinochloa ecotypes, were observed in all hygrophytes and mesophytes used in this study. We thus propose that the alternative of ABA degradation pathways is a key factor with which hygrophytes adapted to anaerobic environments, which resulted from flooding.
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