2. Academic Validation
  3. An E2-E3 pair contributes to seed size control in grain crops

An E2-E3 pair contributes to seed size control in grain crops

  • Nat Commun. 2023 May 29;14(1):3091. doi: 10.1038/s41467-023-38812-y.
Sha Tang # 1,  Zhiying Zhao # 1,  Xiaotong Liu # 2 3,  Yi Sui 1,  Dandan Zhang 1,  Hui Zhi 1,  Yuanzhu Gao 1,  Hui Zhang 1,  Linlin Zhang 4,  Yannan Wang 1,  Meicheng Zhao 3,  Dongdong Li 5,  Ke Wang 1,  Qiang He 1,  Renliang Zhang 1,  Wei Zhang 1,  Guanqing Jia 1,  Wenqiang Tang 2,  Xingguo Ye 1,  Chuanyin Wu 1,  Xianmin Diao 6
Affiliations

Affiliations

  • 1 Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100081, China.
  • 2 Key Laboratory of Molecular and Cellular Biology of Ministry of Education, Hebei Collaboration Innovation Center for Cell Signaling, Hebei Key Laboratory of Molecular and Cellular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, 050024, China.
  • 3 Key Laboratory of Agricultural Water Resources, Hebei Laboratory of Agricultural, Water-Saving, Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Shijiazhuang, 050021, China.
  • 4 College of Biological Sciences, China Agricultural University, Beijing, 100193, China.
  • 5 College of Agronomy and Biotechnology, China Agricultural University, Beijing, 100193, China.
  • 6 Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100081, China. diaoxianmin@caas.cn.
  • # Contributed equally.
PMID: 37248257 DOI: 10.1038/s41467-023-38812-y
Abstract

Understanding the molecular mechanisms that regulate grain yield is important for improving agricultural productivity. Protein ubiquitination controls various aspects of plant growth but lacks understanding on how E2-E3 Enzyme pairs impact grain yield in major crops. Here, we identified a RING-type E3 ligase SGD1 and its E2 partner SiUBC32 responsible for grain yield control in Setaria italica. The conserved role of SGD1 was observed in wheat, maize, and rice. Furthermore, SGD1 ubiquitinates the brassinosteroid receptor BRI1, stabilizing it and promoting plant growth. Overexpression of an elite SGD1 haplotype improved grain yield by about 12.8% per plant, and promote complex biological processes such as protein processing in endoplasmic reticulum, stress responses, photosystem stabilization, and nitrogen metabolism. Our research not only identifies the SiUBC32-SGD1-BRI1 genetic module that contributes to grain yield improvement but also provides a strategy for exploring key genes controlling important traits in Poaceae crops using the Setaria model system.

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