Optimization of rice panicle architecture by specifically suppressing ligand–receptor pairs

Tao Guo, Zi-Qi Lu, Yehui Xiong, Jun-Xiang Shan, Wang-Wei Ye, Nai-Qian Dong, Yi Kan, Yi-Bing Yang, Huai-Yu Zhao, Hong-Xiao Yu, Shuang-Qin Guo, Jie-Jie Lei, Ben Liao, Jijie Chai () and Hong-Xuan Lin ()
Additional contact information
Tao Guo: CAS Centre for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences
Zi-Qi Lu: CAS Centre for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences
Yehui Xiong: Tsinghua University
Jun-Xiang Shan: CAS Centre for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences
Wang-Wei Ye: CAS Centre for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences
Nai-Qian Dong: CAS Centre for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences
Yi Kan: CAS Centre for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences
Yi-Bing Yang: CAS Centre for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences
Huai-Yu Zhao: CAS Centre for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences
Hong-Xiao Yu: CAS Centre for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences
Shuang-Qin Guo: CAS Centre for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences
Jie-Jie Lei: CAS Centre for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences
Ben Liao: CAS Centre for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences
Jijie Chai: Tsinghua University
Hong-Xuan Lin: CAS Centre for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-15

Abstract: Abstract Rice panicle architecture determines the grain number per panicle and therefore impacts grain yield. The OsER1–OsMKKK10–OsMKK4–OsMPK6 pathway shapes panicle architecture by regulating cytokinin metabolism. However, the specific upstream ligands perceived by the OsER1 receptor are unknown. Here, we report that the EPIDERMAL PATTERNING FACTOR (EPF)/EPF-LIKE (EPFL) small secreted peptide family members OsEPFL6, OsEPFL7, OsEPFL8, and OsEPFL9 synergistically contribute to rice panicle morphogenesis by recognizing the OsER1 receptor and activating the mitogen-activated protein kinase cascade. Notably, OsEPFL6, OsEPFL7, OsEPFL8, and OsEPFL9 negatively regulate spikelet number per panicle, but OsEPFL8 also controls rice spikelet fertility. A osepfl6 osepfl7 osepfl9 triple mutant had significantly enhanced grain yield without affecting spikelet fertility, suggesting that specifically suppressing the OsEPFL6–OsER1, OsEPFL7–OsER1, and OsEPFL9–OsER1 ligand–receptor pairs can optimize rice panicle architecture. These findings provide a framework for fundamental understanding of the role of ligand–receptor signaling in rice panicle development and demonstrate a potential method to overcome the trade-off between spikelet number and fertility.

Date: 2023
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DOI: 10.1038/s41467-023-37326-x

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