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A Novel QTL qTGW3 Encodes the GSK3/ SHAGGY-Like Kinase osgsk5/OsSK41 that Interacts with OsARF4 to Negatively Regulate Grain Size and Weight in Rice

引用

Molecular Plant 2018年第5期11卷 736-749页

作者： Zejun Hu Sun-Jie Lu Mei-Jing Wang Haohua He Le Sun Hongru Wang Xue-Huan Liu Ling Jiang Jing-Liang sun Xiaoyun Xin Wei Kong Chengcai Chu Hong-Wei Xue Jinshui Yang Xiaojin Luo Jian-Xiang Liu State Key Laboratory of Genetic Engineering Institute of Plant Biology School of Life Sciences Fudan University Shanghai 200433 China Key Laboratory of Crop Physiology Ecology and Genetic Breeding Ministry of Education Jiangxi Agricultural University Nanchang 330045 China State Key Laboratory of Plant Genomics National Center for Plant Gene Research (Beijing) Institute of Genetics and Developmental Biology Chinese Academy of Sciences Beijing 100101 China National Key Laboratory of Plant Molecular Genetics Institute of Plant Physiology and Ecology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Shanghai 200032 China State Key Laboratory of Plant Physiology and Biochemistry College of Life Sciences Zhejiang University Hangzhou 310027 China

Grain size and shape are important determinants of grain weight and yield in rice. Here, we report a new major quantitative trait locus （QTL）, qTGW3, that controls grain size and weight in rice. This locus, qTGW3, encodes OsSK41 （also known as osgsk5）, a member of the GLYCOGEN SYNTHASE KINASE 3/SHAGGY-like family. Rice near-isogenic lines carrying the loss-of-function allele of OsSK41 have increased grain length and weight. We demonstrate that OsSK41 interacts with and phosphorylates AUXIN RESPONSE FACTOR 4 （OsARF4）. Co-expression of OsSK41 with OsARF4 increases the accumulation of OsARF4 in rice protoplasts. Loss of function of OsARF4 results in larger rice grains. RNA-sequencing analysis suggests that OsARF4 and OsSK41 repress the expression of a common set of downstream genes, including some auxin-responsive genes, during rice grain development. The loss-of-function form of OsSK41 at qTGW3 represents a rare allele that has not been extensively utilized in rice breeding. Suppression of OsSK41 function by either targeted gene editing or QTL pyramiding enhances rice grain size and weight. Thus, our study reveals the important role of OsSK41 in rice grain development and provides new candidate genes for genetic improvement of grain yield in rice and perhaps in other cereal crops.

关键词： QTL mapping GSK3-like family protein osgsk5 OsARF4 grain size and weight Oryza sativa

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