Transcriptome and GWAS Analyses Reveal Candidate Gene for Root Traits of Alfalfa during Germination under Salt Stress
文献类型： 外文期刊
作者： He, Fei 1 ; Yang, Tianhui 2 ; Zhang, Fan 1 ; Jiang, Xueqian 1 ; Li, Xianyang 1 ; Long, Ruicai 1 ; Wang, Xue 1 ; Gao, Ting 2 ; Wang, Chuan 2 ; Yang, Qingchuan 1 ; Chen, Lin 1 ; Kang, Junmei 1 ;
作者机构： 1.Chinese Acad Agr Sci, Inst Anim Sci, Beijing 100193, Peoples R China
2.Ningxia Acad Agr & Forestry Sci, Inst Anim Sci, Yinchuan 750002, Peoples R China
关键词： alfalfa; GWAS; salt stress; root traits; SNP
期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：5.6； 五年影响因子：6.2 ）
ISSN：
年卷期： 2023 年 24 卷 7 期
页码：
收录情况： SCI
摘要： Alfalfa growth and production in China are negatively impacted by high salt concentrations in soils, especially in regions with limited water supplies. Few reliable genetic markers are currently available for salt tolerance selection. As a result, molecular breeding strategies targeting alfalfa are hindered. Therefore, with the continuous increase in soil salinity in agricultural lands, it is indispensable that a salt-tolerant variety of alfalfa is produced. We collected 220 alfalfa varieties around the world for resequencing and performed genome-wide association studies (GWASs). Alfalfa seeds were germinated in saline water with different concentrations of NaCl, and the phenotypic differences in several key root traits were recorded. In the phenotypic analysis, the breeding status and geographical origin strongly affected the salt tolerance of alfalfa. Forty-nine markers were significantly associated with salt tolerance, and 103 candidate genes were identified based on linkage disequilibrium. A total of 2712 differentially expressed genes were upregulated and 3570 were downregulated based on transcriptomic analyses. Some candidate genes that affected root development in the seed germination stage were identified through the combination of GWASs and transcriptome analyses. These genes could be used for molecular breeding strategies to increase alfalfa's salt tolerance and for further research on salt tolerance in general.
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