2013 Fiscal Year Final Research Report
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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| Project Period (FY) |
2010-04-01 – 2014-03-31
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| Keywords | 分枝 / メリステム / イネ / 穂（花序） |
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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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[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
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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
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