Cytokinin oxidase regulates rice grain production

被引：1387

作者：

Ashikari, M

Sakakibara, H

Lin, SY

Yamamoto, T

Takashi, T

Nishimura, A

Angeles, ER

Qian, Q

Kitano, H

Matsuoka, M ^{[1
]}

机构：

[1] Nagoya Univ, Biosci & Biotechnol Ctr, Nagoya, Aichi 4648601, Japan

[2] RIKEN, Plant Sci Ctr, Yokohama, Kanagawa 2300045, Japan

[3] Honda Res Inst Japan Co Ltd, Chiba 2920818, Japan

[4] China Natl Rice Res Inst, Hangzhou 310006, Peoples R China

来源：

SCIENCE | 2005年 / 309卷 / 5735期

关键词：

D O I：

10.1126/science.1113373

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

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.

引用

页码：741 / 745

页数：5

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