文献类型： 外文期刊

作者： Ravelombola, Waltram ¹ ; Dong, Lindgi ³ ; Barickman, Thomas Casey ⁴ ; Xiong, Haizheng ⁵ ; Manley, Aurora ¹ ; Cason, John ⁶ ; Pham, Hanh ⁷ ; Zia, Bazgha ⁸ ; Mou, Beiquan ⁹ ; Shi, Ainong ⁵ ;

作者机构： 1.Texas A&M AgriLife Res, 11708 Highway 70 South, Vernon, TX 76384 USA

2.Texas A&M Univ, Dept Soil & Crop Sci, 370 Olsen Blvd, College Stn, TX 77843 USA

3.Hebei Acad Agr & Forestry Sci, Inst Cash Crops, Shijiazhuang 050051, Peoples R China

4.Mississippi State Univ, North Mississippi Res & Extens Ctr, Dept Plant & Soil Sci, Verona, MS 38879 USA

5.Univ Arkansas, Dept Hort, Fayetteville, AR 72701 USA

6.Texas A&M AgriLife Res, 1129 North US Highway 281, Stephenville, TX 76401 USA

7.Texas A&M AgriLife Res, 1102 East Drew St, Lubbock, TX 79403 USA

8.US Vegetable Lab USVL, 2700 Savannah Hwy, Charleston, SC 29414 USA

9.ARS, USDA, 1636 E Alisal St, Salinas, CA 93905 USA

关键词： cowpea; seedling; salt; GWAS; whole genome

期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：5.6； 五年影响因子：6.2 ）

ISSN： 1661-6596

年卷期： 2023 年 24 卷 20 期

页码：

收录情况： SCI

摘要： Cowpea (Vigna unguiculata (L.) Walp.) is a diploid legume crop used for human consumption, feed for livestock, and cover crops. Earlier reports have shown that salinity has been a growing threat to cowpea cultivation. The objectives of this study were to conduct a genome-wide association study (GWAS) to identify SNP markers and to investigate candidate genes for salt tolerance in cowpea. A total of 331 cowpea genotypes were evaluated for salt tolerance by supplying a solution of 200 mM NaCl in our previous work. The cowpea panel was genotyped using a whole genome resequencing approach, generating 14,465,516 SNPs. Moreover, 5,884,299 SNPs were used after SNP filtering. GWAS was conducted on a total of 296 cowpea genotypes that have high-quality SNPs. BLINK was used for conducting GWAS. Results showed (1) a strong GWAS peak on an 890-bk region of chromosome 2 for leaf SPAD chlorophyll under salt stress in cowpea and harboring a significant cluster of nicotinamide adenine dinucleotide (NAD) dependent epimerase/dehydratase genes such as Vigun02g128900.1, Vigun02g129000.1, Vigun02g129100.1, Vigun02g129200.1, and Vigun02g129500.1; (2) two GWAS peaks associated with relative tolerance index for chlorophyll were identified on chromosomes 1 and 2. The peak on chromosome 1 was defined by a cluster of 10 significant SNPs mapped on a 5 kb region and was located in the vicinity of Vigun01g086000.1, encoding for a GATA transcription factor. The GWAS peak on chromosome 2 was defined by a cluster of 53 significant SNPs and mapped on a 68 bk region of chromosome 2, and (3) the highest GWAS peak was identified on chromosome 3, and this locus was associated with leaf score injury. This peak was within the structure of a potassium channel gene (Vigun03g144700.1). To the best of our knowledge, this is one the earliest reports on the salt tolerance study of cowpea using whole genome resequencing data.