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OsBRXL4 Regulates Shoot Gravitropism and Rice Tiller Angle through Affecting LAZY1 Nuclear Localization

Molecular Plant 2019年第8期12卷 1143-1156页

作者： Zhen Li Yan Liang Yundong Yuan Lei Wang Xiangbing Meng Guosheng Xiong Jie Zhou Yueyue Cai ningpei han Lekai Hua Guifu Liu Jiayang Li Yonghong Wang State Key Laboratory of Plant Genomics and National Center for Plant Gene Research (Beijing) Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100039China CAS Center for Excellence in Molecular Plant Sciences Chinese Academy of SciencesShanghai 200032China Institute of Environment and Sustainable Development in Agriculture Chinese Academy of Agricultural SciencesBeijing 100081China Plant Phenomics Research Center Nanjing Agriculture UniversityNanjing 210095China Root Biology Center College of Resources and EnvironmentFujian Agriculture and Forestry UniversityFuzhou 350002China

Rice tiller angle is a key agronomic trait that contributes to ideal plant architecture and grain ***1 (LA1) was previously shown to control tiller angle via affecting shoot gravitropism,but the underlying molecular mechanism remains largely *** this study,we identified an LA1-interacting protein named Brevis Radix Like 4 (OsBRXL4).We showed that the interaction between OsBRXL4 and LA1 occurs at the plasma membrane and that their interaction determines nuclear localization of *** found that nuclear localization of LA1 is essential for its function,which is different from AtLA1,its Arabidopsis *** of OsBRXL4 leads to a prostrate growth phenotype,whereas OsBRXLs RNAi plants,in which the expression levels of OsBRXLI,OsBRXL4,and OsBRXL5 were decreased,display a compact *** genetic analysis also supported that OsBRXL4 controls rice tiller angle by affecting nuclear localization of ***,we demonstrated that OsBRXL4 regulates the shoot gravitropism through affecting polar auxin transport as did *** together,our study not only identifies OsBRXL4 as a regulatory component of rice tiller angle but also provides new insights into genetic regulation of rice plant architecture.

关键词： OsBRXL4 LA1 nuclear localization shoot gravitropism tiller angle rice

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