Assessment of Genetic Diversity in Blackgram [Vigna mungo (L.) Hepper] Genotypes Evaluated under Different Seasons
International Journal of Current Microbiology and Applied Sciences
Blackgram is an important kharif pulse crop in Karnataka and popularization of its cultivation during summer in command areas is very crucial for horizontal expansion of the crop for increasing production. There is need of systematic studies for identification of diverse genotypes for utilization in breeding for varieties for kharif as well as summer season. Twenty five genotypes were evaluated in six environments for 11 quantitative characters for quantifying genetic diversity using
... ty using Mahalanobis' generalized distance (D 2 ). The analysis was performed over pooled data. The genotypes were grouped into nine distinct clusters indicating the existence of high degree of genetic diversity among the genotypes evaluated in the present study and hence these genotypes could serve as source for selecting diverse parents for use in hybridization programme to get transgressive segregants. The relative contribution of reproductive period was maximum (80.67 %) to the divergence of genotypes followed by 100-seed weight (10.67 %). The cluster pattern revealed that, cluster I was the largest, consisting of 11 genotypes followed by cluster II (7) and remaining seven clusters were solitary. The inter-cluster distance ranged from 0.42 to 20.57 indicating magnitude of diversity is not that high. Based on inter-cluster distance and cluster mean values, genotypes viz., PU-31, TRCRU-22, LBG-685, BDU-20 were identified as diverse genotypes. They possess desirable traits like earliness, tall plants, more number of pods, clusters and high single plant yield which could be involved in recombination breeding programme for the improvement of blackgram.