LAZY1 controls rice shoot gravitropism through regulating polar auxin transport

作     者：Peijin Li1 Yonghong Wang1 Qian Qian2 Zhiming Fu1 Mei Wang1 Dali Zeng1,2 Baohua Li1 Xiujie Wang1 Jiayang Li1 1 State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China 2 State Key Laboratory of Rice Biology, China National Rice Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou 310006, China 

作者机构：State Key Laboratory of Plant Genomics and National Center for Plant Gene Research Institute of Genetics and Developmental Biology Chinese Academy of Sciences Beijing China State Key Laboratory of Rice Biology China National Rice Research Institute Chinese Academy of Agricultural Sciences Hangzhou China 

出 版 物：《Cell Research》 (细胞研究(英文版))

年 卷 期：2007年第17卷第5期

页      面：402-410页

核心收录：

学科分类：0710[理学-生物学] 0831[工学-生物医学工程（可授工学、理学、医学学位）] 09[农学] 0903[农学-农业资源与环境] 

基　　金：国家科技部项目 国家自然科学基金 

主　　题：LAZY1 gravitropism auxin transport tiller angle plant architecture Oryza sativa L. 

摘      要：Tiller angle of rice (Oryza sativa L.) is an important agronomic trait that contributes to grain production, and haslong attracted attentions of breeders for achieving ideal plant architecture to improve grain yield. Although enormousefforts have been made over the past decades to study mutants with extremely spreading or compact tillers, the molecularmechanism underlying the control of tiller angle of cereal crops remains unknown. Here we report the cloning of theLAZY1 (LA1) gene that regulates shoot gravitropism by which the rice tiller angle is controlled. We show that LA1, anovel grass-specific gene, is temporally and spatially expressed, and plays a negative role in polar auxin transport (PAT).Loss-of-function of LA1 enhances PAT greatly and thus alters the endogenous IAA distribution in shoots, leading to thereduced gravitropism, and therefore the tiller-spreading phenotype of rice plants.