Analysis of molecular mechanisms controlling shoot branching
| Project/Area Number |
22247004
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Plant molecular biology/Plant physiology
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| Research Institution | The University of Tokyo |
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Principal Investigator |
JUNKO Kyozuka 東京大学, 農学生命科学研究科, 准教授 (90273838)
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| Co-Investigator(Kenkyū-buntansha) |
志水 佐江 名古屋大学, 生命農学研究科, 研究員 (90397472)
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| Project Period (FY) |
2010-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥43,420,000 (Direct Cost: ¥33,400,000、Indirect Cost: ¥10,020,000)
Fiscal Year 2013: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
Fiscal Year 2012: ¥10,920,000 (Direct Cost: ¥8,400,000、Indirect Cost: ¥2,520,000)
Fiscal Year 2011: ¥13,390,000 (Direct Cost: ¥10,300,000、Indirect Cost: ¥3,090,000)
Fiscal Year 2010: ¥12,350,000 (Direct Cost: ¥9,500,000、Indirect Cost: ¥2,850,000)
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| Keywords | 分枝 / メリステム / イネ / 穂（花序） / 穂の分枝 / TAWAWA1(TAW1) / DNA結合配列 / 相互作用 / BOP / TAWAWA1(TAWA1) / 種子数 / 栽培密度 / 花序 / 成長相の転換 / TAW1 / PAP2 / 腋芽 / ストリゴラクトン / 休眠 / D10 / D14 |
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| Research Abstract |
The number of grains produced per inflorescence is a critical determinant of yield in rice. During inflorescence development, meristems grow as a branch to generate further meristems which each terminates as a grain-producing spikelet. In the dominant gain-of-function mutant taw1-D, a delay in spikelet specification causes prolonged branch formation, resulting in increased grain production. We show that the taw1-D2 allele mediates more than a 40% rise in yield per plant in a commercial rice cultivar. In contrast, reduction of TAW1 activity accelerates spikelet formation resulting in a decrease in grain number. TAW1, encoding a nuclear protein of an unknown function, shows intense expression in panicle branch meristems, which then disappears from incipient spikelet meristems. It appears that TAW1 regulates the panicle architecture through suppression of spikelet meristem identity. We thus propose TAW1 as a novel molecular link between grain number and meristem phase change in rice.
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Report
(5 results)
Research Products
(17 results)
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[Journal Article] TAWAWA1, a novel regulator of rice inflorescence architecture, functions through the suppression of meristem phase transition2013
Author(s)
Yoshida A, Sasao M, Yasuno N, Takagi K, Daimon Y, Chen R, Yamazaki R, Tokunaga H, Kitaguchi Y, Sato Y, Nagamura Y, Usijima T, Kumamaru T, Iida S, Maekawa M, Kyozuka J
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Journal Title
Proc. Natl. Acad. Sci. USA
Volume: 110
Pages: 767-772
Related Report
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[Journal Article] LAX PANICLE2 of Rice Encodes a Novel Nuclear Protein and Regulates the Formation of Axillary Meristems2011
Author(s)
Tabuchi H, Zhang Y, Hattori S, Omae M, Shimizu-Sato S, Oikawa T, Qian Q, Nishimura M, Kitano H, Xie H, Fang X, Yoshida H, Kyozuka J, Chen F, Sato Y
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Journal Title
Plant Cell
Volume: 23
Pages: 3276-3287
Related Report
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[Journal Article] FINE CULMI (FCI) works downstream of strigolactones to inhibit the outgrowth of axillary buds in rice.2010
Author(s)
Minakuchi K, Kameoka H, Yasuno N, Umehara M, Luo L, Kobayashi K, Hanada A, Ueno K, Asami T, YamaguchiS, Kyozuka J.
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Journal Title
Plant & Cell Physiology
Volume: 51
Pages: 1127-1135
Related Report
Peer Reviewed
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