西亚试剂：Linking differential domain functions of the GS3 protein to

Linking differential domain functions of the GS3 protein to natural variation of grain size in rice
Hailiang Maoa, Shengyuan Suna, Jialing Yaob, Chongrong Wanga, Sibin Yua, Caiguo Xua, Xianghua Lia, and Qifa Zhanga,1

aNational Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan) and
bCollege of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, China

Grain yield in many cereal crops is largely determined by grain size. Here we report the genetic and molecular characterization of GS3, a major quantitative trait locus for grain size. It functions as a negative regulator of grain size and organ size. The wild-type isoform is composed of four putative domains: a plant-specific organ size regulation (OSR) domain in the N terminus, a transmembrane domain, a tumor necrosis factor receptor/nerve growth factor receptor (TNFR/NGFR) family cysteine-rich domain, and a von Willebrand factor type C (VWFC) in the C terminus. These domains function differentially in grain size regulation. The OSR domain is both necessary and sufficient for functioning as a negative regulator. The wild-type allele corresponds to medium grain. Loss of function of OSR results in long grain. The C-terminal TNFR/NGFR and VWFC domains show an inhibitory effect on the OSR function; loss-of-function mutations of these domains produced very short grain. This study linked the functional domains of the GS3 protein to natural variation of grain size in rice.

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