Diallel analysis of cotton leaf curl virus (CLCuV) disease, earliness, yield and fiber traits under CLCuV infestation in upland cotton

摘要

Genetic effects of CLCuV, earliness, yield, and lint traits were studied in a 6 × 6 F1 and F2 diallel populations of upland cotton. Hayman and Mather’s genetic model (D and H) was used to determine the genetic mechanism and mode of inheritance for selected variables. The breeding material comprised one CLCuV tolerant (CIM-1100) and five CLCuV susceptible cotton cultivars (CIM-109, CIM-240, CIM-1100, FH-682, BH-36, CRIS-9), crossed in a 6 × 6 diallel fashion to generate thirty F1 hybrids. An additive- dominance model was adequate for lint %, CLCuV resistant and affected plants, and partially adequate for bolls plant-1 and yield in both generations. However, the data were adequate for lint index and earliness in F1 and F2 populations, respectively, and partially fit in their respective generations. Additive effects controlled all the traits except bolls plant-1 and yield that proscribed non-additively in both generations. Most of the traits showed an unequal proportion of positive (U) and negative (V) alleles in the loci (H2