An inter-subspecific mapping population was generated by crossing
V. mungo var. mungo (cv. TU 94-2, bruchid susceptible) and
V. mungo var. silvestris (bruchid resistant). About 37.8% of the bruchid completed their lifecycle on seeds of
V. mungo var. silvestris compared with 100% on the susceptible variety TU 94-2. The total developmental period of
C. maculatus on Vigna mungo var. silvestris was considerably extended (88 days as compared with 34 days on TU 94-2). A genetic linkage map constructed using recombinant inbred lines (RILs) in F9 generation with 428 markers [86 random amplified polymorphic DNA (RAPD), 47 simple sequence repeat (SSR), 41 inter-SSR (ISSR), 254 amplified fragment length polymorphism (AFLP)] was used for QTL detection. One hundred four individuals were used for detection of QTLs associated with bruchid resistance. The RILs exhibited a high level of variation in percentage adult emergence (0-100%) and developmental period (0-105 days). Two QTLs, Cmrae1. 1 and Cmrae1. 2, were identified for percentage adult emergence, on linkage group (LG) 3 and 4, respectively. For developmental period, six QTLs were identified, with two QTLs
(Cmrdp1. 1 and Cmrdp1. 2) on LG 1, three QTLs (Cmrdp1. 3,
Cmrdp1. 4, and Cmrdp1. 5) on LG 2, and one QTL (Cmrdp1. 6) on LG 10. |