Genetic divergence studies in Pigeonpea inbreds
Quantitative assessment of genetic divergence in 47 pigeonpea genotypes (22 B-lines and 25 R-lines) with respect to seed yield and yield components clustered them into 10 different groups. Among the ten clusters, cluster I was the largest comprising of 35 genotypes, representing collections from Andhra Pradesh, Karnataka and Bihar, while the clusters IV, V, VI, VII, VIII and X comprised of one genotype each. The distribution pattern of genotypes into different clusters revealed no parallelism between genetic and geographic diversity. An analysis of inter-cluster D2 values revealed higher divergence between cluster VIII and cluster IX, followed by cluster IX and X indicated that hybridization between parents selected from these clusters may result in maximum heterosis. Further, the results on cluster means revealed that there was no cluster with at least one genotype with all the desirable traits, indicating the need for judicious combination of all the targeted traits required hybridization between the selected genotypes from divergent clusters. In addition, number of seeds per pod, 100 seed weight, plant height, days to maturity and seed yield per plant together contributed for about 81.31 per cent of the total divergence and hence these traits to be emphasized during selection.
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