G-protein βγ subunits determine grain size through interaction with MADS-domain transcription factors in rice

Qian Liu, Ruixi Han, Kun Wu, Jianqing Zhang, Yafeng Ye, Shuansuo Wang, Jianfeng Chen, Yajun Pan, Qi Li, Xiaopeng Xu, Jiawu Zhou, Dayun Tao, Yuejin Wu and Xiangdong Fu ()
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Qian Liu: Chinese Academy of Sciences
Ruixi Han: Chinese Academy of Sciences
Kun Wu: Chinese Academy of Sciences
Jianqing Zhang: Chinese Academy of Sciences
Yafeng Ye: Chinese Academy of Sciences
Shuansuo Wang: Chinese Academy of Sciences
Jianfeng Chen: Chinese Academy of Sciences
Yajun Pan: Chinese Academy of Sciences
Qi Li: Chinese Academy of Sciences
Xiaopeng Xu: Chinese Academy of Sciences
Jiawu Zhou: Institute Yunnan Academy of Agricultural Sciences
Dayun Tao: Institute Yunnan Academy of Agricultural Sciences
Yuejin Wu: Chinese Academy of Sciences
Xiangdong Fu: Chinese Academy of Sciences

Nature Communications, 2018, vol. 9, issue 1, 1-12

Abstract: Abstract The simultaneous improvement of grain quality and yield of cereal crops is a major challenge for modern agriculture. Here we show that a rice grain yield quantitative trait locus qLGY3 encodes a MADS-domain transcription factor OsMADS1, which acts as a key downstream effector of G-protein βγ dimers. The presence of an alternatively spliced protein OsMADS1lgy3 is shown to be associated with formation of long and slender grains, resulting in increases in both grain quality and yield potential of rice. The Gγ subunits GS3 and DEP1 interact directly with the conserved keratin-like domain of MADS transcription factors, function as cofactors to enhance OsMADS1 transcriptional activity and promote the co-operative transactivation of common target genes, thereby regulating grain size and shape. We also demonstrate that combining OsMADS1 lgy3 allele with high-yield-associated dep1-1 and gs3 alleles represents an effective strategy for simultaneously improving both the productivity and end-use quality of rice.

Date: 2018
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DOI: 10.1038/s41467-018-03047-9

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