Cytokinin oxidase regulates rice grain production

文献类型： 外文期刊

第一作者： Ashikari, M

作者： Ashikari, M;Sakakibara, H;Lin, SY;Yamamoto, T;Takashi, T;Nishimura, A;Angeles, ER;Qian, Q;Kitano, H;Matsuoka, M

作者机构：

期刊名称：SCIENCE （ 影响因子：47.728； 五年影响因子：51.433 ）

ISSN： 0036-8075

年卷期： 2005 年 309 卷 5735 期

页码：

收录情况： SCI

摘要： Most agriculturally important traits are regulated by genes known as quantitative trait loci (QTLs) derived from natural allelic variations. We here show that a QTL that increases grain productivity in rice, Gn1a, is a gene for cytokinin oxidase/ dehydrogenase (OsCKX2), an enzyme that degrades the phytohormone cytokinin. Reduced expression of OsCKX2 causes cytokinin accumulation in inflorescence meristems and increases the number of reproductive organs, resulting in enhanced grain yield. QTL pyramiding to combine loci for grain number and plant height in the same genetic background generated lines exhibiting both beneficial traits. These results provide a strategy for tailormade crop improvement.

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