期刊
PLANT CELL
卷 34, 期 5, 页码 1912-1932出版社
OXFORD UNIV PRESS INC
DOI: 10.1093/plcell/koac057
关键词
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资金
- Ministry of Science and Technology [2021YFF1000200]
- Natural Science Foundation of China [U21A20211, 91935303]
- science and technology major program of Hubei Province [2021ABA011, 2020BBB051]
- earmarked fund for the China Agriculture Research System [CARS-01-03]
This study uncovers the molecular mechanism underlying rice chalkiness and identifies the WCR1(A) allele as a promising natural variant for improving rice quality.
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 WCR1(A) and WCR1(G), 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 WCR1(A) 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 WCR1(A), with application potential for rice breeding.
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