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- Title
Natural variation in WHITE-CORE RATE 1 regulates redox homeostasis in rice endosperm to affect grain quality.
- Authors
Wu, Bian; Yun, Peng; Zhou, Hao; Xia, Duo; Gu, Yuan; Li, Pingbo; Yao, Jialing; Zhou, Zhuqing; Chen, Jianxian; Liu, Rongjia; Cheng, Shiyuan; Zhang, Hao; Zheng, Yuanyuan; Lou, Guangming; Chen, Pingli; Wan, Shanshan; Zhou, Mingsong; Li, Yanhua; Gao, Guanjun; Zhang, Qinglu
- Abstract
Grain chalkiness reduces the quality of rice (Oryza sativa) and is a highly undesirable trait for breeding and marketing. However, the underlying molecular cause of chalkiness remains largely unknown. Here, we cloned the F-box gene WHITE-CORE RATE 1 (WCR1), which negatively regulates grain chalkiness and improves grain quality in rice. A functional A/G variation in the promoter region of WCR1 generates the alleles WCR1A and WCR1G , which originated from tropical japonica and wild rice Oryza rufipogon , respectively. OsDOF17 is a transcriptional activator that binds to the AAAAG cis-element in the WCR1A promoter. WCR1 positively affects the transcription of the metallothionein gene MT2b and interacts with MT2b to inhibit its 26S proteasome-mediated degradation, leading to decreased reactive oxygen species production and delayed programmed cell death in rice endosperm. This, in turn, leads to reduced chalkiness. Our findings uncover a molecular mechanism underlying rice chalkiness and identify the promising natural variant WCR1A , with application potential for rice breeding.
- Publication
Plant Cell, 2022, Vol 34, Issue 5, p1912
- ISSN
1040-4651
- Publication type
Article
- DOI
10.1093/plcell/koac057