Loci discovery, network-guided approach, and genomic prediction for drought tolerance index in a multi-parent advanced generation intercross (MAGIC) cowpea population
作者机构：Department of HorticultureUniversity of ArkansasFayettevilleAR 72701USA Texas A&M AgriLife Research&ExtensionVernonTX 76384USA Department of NematologyUniversity of CaliforniaRiversideCA 92521USA
出 版 物：《Horticulture Research》 (园艺研究（英文）)
年 卷 期：2021年第8卷第1期
页 面：292-304页
核心收录：
学科分类：0710[理学-生物学] 07[理学] 09[农学] 071007[理学-遗传学] 0901[农学-作物学] 090102[农学-作物遗传育种]
基 金：NSF-BREAD USAID Feed the Future Innovation Lab for Collaborative Research on Grain Legumes, (EDH-A-00-07-00005) United States Agency for International Development, USAID, (AID-OAA-A-13-00070)
摘 要：Cowpea is a nutrient-dense legume that significantly contributes to the population’s diet in sub-Saharan Africa and other regions of the *** cowpea cultivars to be more resilient to abiotic stress such as drought would be of great *** use of a multi-parent advanced generation intercross(MAGIC)population has been shown to be efficient in increasing the frequency of rare alleles that could be associated with important agricultural *** addition,drought tolerance index has been reported to be a reliable parameter for assessing crop tolerance to water-deficit ***,the objectives of this study were to evaluate the drought tolerance index for plant growth habit,plant maturity,flowering time,100-seed weight,and grain yield in a MAGIC cowpea population,to conduct genome-wide association study(GWAS)and identify single nucleotide polymorphism(SNP)markers associated with the drought tolerance indices,to investigate the potential relationship existing between the significant loci associated with the drought tolerance indices,and to conduct genomic selection(GS).These analyses were performed using the existing phenotypic and genotypic data published for the MAGIC population which consisted of 305 F8 recombinant inbred lines(RILs)developed at University of California,*** results indicated that:(1)large variation in drought tolerance indices existed among the cowpea genotypes,(2)a total of 14,18,5,5,and 35 SNPs were associated with plant growth habit change due to drought stress,and drought tolerance indices for maturity,flowering time,100-seed weight,and grain yield,respectively,(3)the network-guided approach revealed clear interactions between the loci associated with the drought tolerance traits,and(4)the GS accuracy varied from low to *** results could be applied to improve drought tolerance in cowpea through marker-assisted selection(MAS)and genomic selection(GS).To the best of our knowledge,this is the first re
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