The basic helix-loop-helix transcription factor gene, OsbHLH38, plays a key role in controlling rice salt tolerance
文献类型： 外文期刊
作者： Du, Fengping 1 ; Wang, Yinxiao 1 ; Wang, Juan 1 ; Li, Yingbo 1 ; Zhang, Yue 1 ; Zhao, Xiuqin 1 ; Xu, Jianlong 1 ; Li, Zhikang 1 ; Zhao, Tianyong 2 ; Wang, Wensheng 1 ; Fu, Binying 1 ;
作者机构： 1.Chinese Acad Agr Sci, Inst Crop Sci, State Key Lab Crop Gene Resources & Breeding, Beijing 100081, Peoples R China
2.Northwest A&F Univ, Coll Life Sci, State Key Lab Crop Stress Biol Arid Areas, Yangling 712100, Peoples R China
3.Anhui Agr Univ, Hefei 230036, Peoples R China
4.Chinese Acad Agr Sci, Natl Nanfan Res Inst Sanya, Hainan Yazhou Bay Seed Lab, Sanya 572024, Peoples R China
关键词： abscisic acid; genome-wide association analysis; rice; salt tolerance; seed germination
期刊名称：JOURNAL OF INTEGRATIVE PLANT BIOLOGY （ 影响因子：11.4； 五年影响因子：10.1 ）
ISSN： 1672-9072
年卷期： 2023 年
页码：
收录情况： SCI
摘要： The plant hormone abscisic acid (ABA) is crucial for plant seed germination and abiotic stress tolerance. However, the association between ABA sensitivity and plant abiotic stress tolerance remains largely unknown. In this study, 436 rice accessions were assessed for their sensitivity to ABA during seed germination. The considerable diversity in ABA sensitivity among rice germplasm accessions was primarily reflected by the differentiation between the Xian (indica) and Geng (japonica) subspecies and between the upland-Geng and lowland-Geng ecotypes. The upland-Geng accessions were most sensitive to ABA. Genome-wide association analyses identified four major quantitative trait loci containing 21 candidate genes associated with ABA sensitivity of which a basic helix-loop-helix transcription factor gene, OsbHLH38, was the most important for ABA sensitivity. Comprehensive functional analyses using knockout and overexpression transgenic lines revealed that OsbHLH38 expression was responsive to multiple abiotic stresses. Overexpression of OsbHLH38 increased seedling salt tolerance, while knockout of OsbHLH38 increased sensitivity to salt stress. A salt-responsive transcription factor, OsDREB2A, interacted with OsbHLH38 and was directly regulated by OsbHLH38. Moreover, OsbHLH38 affected rice abiotic stress tolerance by mediating the expression of a large set of transporter genes of phytohormones, transcription factor genes, and many downstream genes with diverse functions, including photosynthesis, redox homeostasis, and abiotic stress responsiveness. These results demonstrated that OsbHLH38 is a key regulator in plant abiotic stress tolerance.
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