Yueying Wang, Yang Lv, Haiping Yu, Peng Hu, Yi Wen, Junge Wang, Yiqing Tan, Hao Wu, Lixin Zhu, Kaixiong Wu, Bingze Chai, Jialong Liu, Dali Zeng, Guangheng Zhang, Li Zhu, Zhenyu Gao, Guojun Dong, Deyong Ren, Lan Shen, Qiang Zhang, Qing Li, Longbiao Guo, Guosheng Xiong, Qian Qian, Jiang Hu
Grain size is an important determinant of grain yield in rice. Although dozens of grain size genes have been reported, the molecular mechanism in controlling grain size remains to be further elucidated. Here, we report the cloning and characterization of GR5 (GRAIN ROUND 5), which is allelic to SMOS1/SHB/RLA1/NGR5 and encodes a member of an AP2 transcription factor. GR5 acts as a transcription activator and determines grain size by influencing cell proliferation and expansion. We demonstrated that GR5 physically interacts with five Gγ subunit proteins including RGG1, RGG2, DEP1, GS3 and GGC2, and acts downstream of G protein complex...
August 17, 2023: Plant communications