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A G-protein pathway determines grain size in rice

Author

Listed:
  • Shengyuan Sun

    (Huazhong Agricultural University)

  • Lei Wang

    (Huazhong Agricultural University)

  • Hailiang Mao

    (Huazhong Agricultural University)

  • Lin Shao

    (Huazhong Agricultural University)

  • Xianghua Li

    (Huazhong Agricultural University)

  • Jinghua Xiao

    (Huazhong Agricultural University)

  • Yidan Ouyang

    (Huazhong Agricultural University)

  • Qifa Zhang

    (Huazhong Agricultural University)

Abstract

Manipulating grain size is an effective strategy for increasing cereal yields. Here we identify a pathway composed of five subunits of the heterotrimeric G proteins that regulate grain length in rice. The Gβ protein is essential for plant survival and growth. Gα provides a foundation for grain size expansion. Three Gγ proteins, DEP1, GGC2 and GS3, antagonistically regulate grain size. DEP1 and GGC2, individually or in combination, increase grain length when in complex with Gβ. GS3, having no effect on grain size by itself, reduces grain length by competitively interacting with Gβ. By combining different G-protein variants, we can decrease grain length by up to 35% or increase it by up to 19%, which leads to over 40% decreasing to 28% increasing of grain weight. The wide existence of such a conserved system among angiosperms suggests a possible general predictable approach to manipulating grain/organ sizes.

Suggested Citation

  • Shengyuan Sun & Lei Wang & Hailiang Mao & Lin Shao & Xianghua Li & Jinghua Xiao & Yidan Ouyang & Qifa Zhang, 2018. "A G-protein pathway determines grain size in rice," Nature Communications, Nature, vol. 9(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-03141-y
    DOI: 10.1038/s41467-018-03141-y
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    Cited by:

    1. Peng Xie & Sanyuan Tang & Chengxuan Chen & Huili Zhang & Feifei Yu & Chao Li & Huimin Wei & Yi Sui & Chuanyin Wu & Xianmin Diao & Yaorong Wu & Qi Xie, 2022. "Natural variation in Glume Coverage 1 causes naked grains in sorghum," Nature Communications, Nature, vol. 13(1), pages 1-13, December.
    2. Qiuli Zhang & Renhong Wu & Tao Hong & Dachuan Wang & Qiaolong Li & Jiayi Wu & Han Zhang & Kai Zhou & Hongxia Yang & Ting Zhang & JinXiang Liu & Nan Wang & Yinghua Ling & Zhenglin Yang & Guanghua He & , 2024. "Natural variation in the promoter of qRBG1/OsBZR5 underlies enhanced rice yield," Nature Communications, Nature, vol. 15(1), pages 1-19, December.

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