Genetic divergence analysis in dolichos bean (Dolichos lablal L var. typicus)

Abstract

The genetic divergence analysis was conducted for thirty genotypes of dolichos bean which consisted local collections of Odisha, Bihar and Jharkhand. All the genotypes were investigated for 23 quantitative traits and grouped into six clusters based on Tocher’s clustering approach. Substantial amount of variability was observed among the clusters for studied traits. The cluster I was reported as the largest among the six clusters having 12 genotypes followed by cluster III and cluster II with eight and five genotypes respectively. However, clusters IV and V comprised one genotypes in each and cluster VI had three genotypes. The highest cluster mean was observed in cluster VI for the traits like number of racemes per plant, pod width, number of fresh pods per plant, 100 seed weight, average pod weight and fresh pod yield per plant. Hence, genotypes from this cluster hold promise for transferring the yield and yield attributing characters in breeding programmes. Moreover, Cluster IV recorded minimum number of days for first flowering i.e.67 days and can be considered helpful in developing early varieties of dolichos bean. The inter-cluster D2 value was minimum between cluster I and cluster IV and maximum between cluster IV and VI followed by IV and V. Principal component analysis reported that the first six PCAs contributed to 86% of total variation for the traits. Among the PCAs value of six components, PC1 amounted highest to 37.79%.