Association Analysis of Low Phosphorus Efficiency in Cowpea.

Cowpea (Vigna unguiculataL. Walp.) is an important grain legume, vegetable and fodder crop in tropical and subtropical region in the world. Lower phosphorus (P) availability is a constraint to cowpea production in most of cowpea-growing regions. Development of varieties with low P use efficiency will be of great value to cowpea production. In this study, a total of 360 cowpea germplasms were used to conduct association analysis of low P use efficiency in cowpea with genotyping by sequencing (GBS) approach. SNP markers will be identified to be associated with low P use efficiency. The result will provide a tool to facilitate MAS (marker-assisted selection) in the cowpea breeding of low P efficiency varieties.