Chanjuan Ye, Dagang Chen, XinQiao Zhou, Jie Guo, Lu Dai, Xinyi Lin, Hongbo Li, Yuanhao Ma, Rui Cao, Bin Jia, Shu Jiang, Yanduan Hu, Yi Zou, Juan Liu, Qixing Zheng, Hai Zhang, Guo Tao, Ke Chen, Chuhan Liu
Summary statement This study demonstrates that GW2 overexpression causes non‐lethal pleiotropic defects and identifies aquaporin OsPIP2;1 as its potential target. GW2 interacts with OsPIP2;1 and establishes a novel regulatory module controlling grain size through modulation of water transport and photosynthetic efficiency.