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Quantitative trait loci influencing days to flowering and plant height in cowpea,Vigna unguiculata(L.) Walp

文献类型： 外文期刊

作者： Angira, Brijesh 1 ; Zhang, Yang 1 ; Scheuring, Chantel F. 1 ; Zhang, Yadong 2 ; Masor, Laura 1 ; Coleman, Julie R.; 1 ;

作者机构： 1.Texas A&M Univ, Dept Soil & Crop Sci, College Stn, TX 77843 USA

2.Jiangsu Acad Agr Sci, Inst Food Crops, Nanjing 210014, Jiangsu, Peoples R China

关键词： QTL mapping; Plant height; Days to flowering; Genomic position; Cowpea

期刊名称：MOLECULAR GENETICS AND GENOMICS （ 影响因子：3.291； 五年影响因子：3.257 ）

ISSN： 1617-4615

年卷期： 2020 年 295 卷 5 期

页码：

收录情况： SCI

摘要： Cowpea (Vigna unguiculate(L.) Walp.) is a worldwide important multifunctional legume crop for food grain, vegetable, fodder, and cover crop. Nevertheless, only limited research has been conducted on agronomic traits. Here, we report quantitative trait locus (QTL) analysis of the days to flowering (DTF) and plant height (PH) using a dense SNP linkage map recently developed from a recombinant inbred line (RIL) population derived from a cross between Golden Eye Cream and IT98K-476-8. The population was phenotyped for DTF and PH through field and greenhouse trials under two environments. The QTLs controlling these traits were mapped using multiple-environment combined and individual trial phenotypic data. The combined data analysis identified one major QTL (qDTF9.1) for DTF, and one major QTL (qPH9.1) and a minor QTL (qPH4.1) for PH.qDTF9.1andqPH9.1were adjacent to each other on Chromosome 9 and each explained 29.3% and 29.5% of the phenotypic variation (PVE), respectively. The individual trial data analysis identified a minor QTL (qDTF2.1) on Chromosome 2 for DTF and two minor QTLs (qPH4.1andqPH4.2) on Chromosome 4 for PH, while the major QTLs,qDTF9.1andqPH9.1, were consistently identified in all trials conducted. Epistasis analysis revealed thatqDTF9.1interacted with one locus on Chromosome 4, contributed 50% of the PVE, andqPH9.1interacted with one locus on each of Chromosomes 4 and 6, contributing 30% and 23% of the PVE, respectively, suggesting that epistasis plays an important role in the trait performance. These results, therefore, provide a deeper understanding of the genetic architecture of plant DTF and PH, and molecular tools necessary for cloning the genes and for enhanced cowpea breeding.

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