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The transcription factor CCT30 promotes rice preharvest sprouting by regulating sugar signalling to inhibit the ABA-mediated pathway

文献类型: 外文期刊

作者: Fan, Xiaowei 1 ; Gao, Fangyuan 3 ; Liu, Yuexin 1 ; Huang, Wen 1 ; Yang, Ying 1 ; Luo, Zhengliang 3 ; Zhang, Jia 1 ; Qi, Feixiang 1 ; Lv, Jianqun 3 ; Su, Xiangwen 3 ; Wang, Lei 1 ; Song, Song 1 ; Ren, Guangjun 3 ; Xing, Yongzhong 1 ;

作者机构: 1.Huazhong Agr Univ, Natl Key Lab Crop Genet Improvement, Hubei Hongshan Lab, Wuhan, Peoples R China

2.Henan Agr Univ, Zhengzhou, Peoples R China

3.Sichuan Acad Agr Sci, Crop Res Inst, Environm Friendly Crop Germplasm Innovat & Genet I, Chengdu, Peoples R China

4.Yazhouwan Natl Lab, Sanya, Peoples R China

关键词: preharvest sprouting; CCT30; OsbZIP37; ABA-mediated pathway; sugar signalling

期刊名称:PLANT BIOTECHNOLOGY JOURNAL ( 影响因子:10.5; 五年影响因子:12.4 )

ISSN: 1467-7644

年卷期: 2025 年 23 卷 2 期

页码:

收录情况: SCI

摘要: Seed dormancy is an important adaptive trait in plants. Proper seed dormancy enables the avoidance of preharvest sprouting in the undesirable conditions like rainfall frequently. In this study, qPSR8, a major QTL for preharvest sprouting, was isolated, and a previously reported heading-date gene, CCT30, was verified as the candidate gene. The CCT30 knockout mutants (CCT30-CR) enhanced seed dormancy and ABA sensitivity as compared with the wild-type ZH11. Conversely, CCT30 overexpressing plants had opposite phenotype changes and had a decreased ABA content. The expression of ABA synthesis genes such as OsNCEDs and ABA signalling genes such as ABI3 and ABI5 were upregulated and sugar metabolism-related genes such as amylase genes were downregulated in CCT30-CR. Correspondingly, fewer free sugars, such as monosaccharides and oligosaccharides, accumulated in CCT30-CR. The freshly harvested seeds from CCT30-CR had no ability to transmit sugar signals when treated with 1% exogenous glucose. In addition, CCT30 interacted with the transcription factor OsbZIP37, which negatively regulates seed dormancy. Overall, CCT30 promotes preharvest sprouting by enhancing sugar signals that inhibit the ABA-mediated pathway, and CCT30 is a good gene for breeding rice varieties resistant to preharvest sprouting.

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