| Project/Area Number |
21710218
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Living organism molecular science
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| Research Institution | University of Tsukuba |
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Principal Investigator |
HASEGAWA Tsuyoshi University of Tsukuba, 大学院・生命環境科学研究科, 研究員 (40431655)
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| Project Period (FY) |
2009 – 2010
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| Project Status |
Completed (Fiscal Year 2010)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2010: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2009: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
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| Keywords | 重力屈性 / 重力屈性鍵化学物質 / 成長抑制物質 / ダイコン下胚軸 / トウモロコシ幼葉鞘 / Cholodny-Went説 / Bruinsma-Hasegawa説 / 植物の運動 / DIMBOA / 3,6'-disinapoylsucrose / 擬似微小重力 / 過重力 |
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| Research Abstract |
Gravity-induced growth inhibitors were isolated from etiolated radish hypocotyls and maize coleoptiles. The radish-derived and maize-derived inhibitors were determined to be 3,6'-disinapoylsucrose (DSS) and 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA) by physicochemical analyses, respectively. When etiolated radish and maize seedlings were placed horizontally, the contents of DSS and DIMBOA rapidly increased in the upper halves of the radish hypocotyls and the maize coleoptiles, respectively. Unilateral application of DSS to the radish hypocotyls and DIMBOA to the maize coleoptiles caused both of them to bend toward the sites of application. This finding suggests that gravitropic stimulation suppresses the growth rates at the upper sides of etiolated radish hypocotyls and maize coleoptiles by increasing the contents of DSS and DIMBOA in the upper halves, causing gravitropic curvature.
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