Mapping and Validation of Alectra vogelii Resistance in the Cowpea Landrace B301

Cowpea is the most important food legume in West and Central Africa a valuable economic commodity region. Among major biotic constraints to cowpea production are root parasitic weeds of which Alectra vogelii (Benth.) increasing importance. The landrace B301 was previously identified as source resistance, but neither genes nor genomic loci conferring this resistance have been mapped. Therefore, map identify genetic markers linked for use molecular improvement cowpea, we developed an F2 population from cross susceptible variety 524B with B301. phenotyped A. genotyped high density single nucleotide polymorphism (SNP) microarray. Putative were mapped populations by categorical trait–multiple interval mapping validated selective genotyping. Selective genotyping indicated that on Vu04 (Rav1) Vu11 (Rav2) significantly associated (p ≤ 0.01). Using marker assisted backcrossing, two introgressed independently into background. Phenotyping segregating backcross families delineated Rav1 10 cM chromosome 4 Rav2 6.7 11. These desirable breeding resistant varieties due their simple inheritance ability confer complete immunity parasite.