Awnindra K Singh, R K Gautam, P K Singh, Krishna Kumar, Naresh Kumar, S Swain and S Dam Roy
Estimation of genetic variability and association analysis in the indigenous landraces of Urdbean (Vigna mungo L. Hepper) of Andaman islands
The morphological differences among 28 promising urdbean landraces and genotypes was planted in the field to estimate the genetic variability, interrelationship for yield and yield attributing traits under tropical islands conditions. The results revealed that there was sufficient genetic variability in the population for plant height, number of branches per plant, number of pods per plant and seed yield per plant, due to high genotypic and phenotypic variances for these traits. Hence, yield improvement in urdbean would be achieved through selection for the above characters. The higher magnitudes of heritability, GCV and genetic advance were observed for plant height followed by number of branches per plant and seed yield per plant. High heritability values associated with high genetic advance were obtained for seed yield per plant, pods per plant and other yield attributing traits, except for number of seeds per pod. High heritability with moderate genetic advance was recorded for 100-seed weight and number of seed per pod. Correlation studies indicated that pods per plant, branches per plant pod length, seeds per pod and 100-seed weight showed highly significant and positive correlation with seed yield per plant. Path coefficient analysis showed that the criteria can be applied visually during bulk selection in early generation and subsequently in advanced generation for pure line selection based on individual plant by selecting genotypes with higher number of pods per plant and higher number of seeds per pod.
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