Genetic variability and association studies in adzuki bean [Vigna angularis (Willd.) Ohwi and Ohashi] under natural farming system
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Date
2021-11-12
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Palampur
Abstract
The current study aimed to estimate genetic diversity among 36 adzuki bean genotypes
including 2 checks (HPU51, Local Totru) evaluated in Randomized Block Design in three
replications during Kharif, 2021 under Zero Budget Natural Farming system. Analysis of
variance revealed significant differences among genotypes for most of the traits studied,
suggesting prevalence of sufficient genetic variability and scope for the selection of these
traits. Phenotypic coefficient of variation (PCV) was observed to be higher than genotypic
coefficient of variation (GCV) indicating the presence of environmental influence in
governance of traits. Moderate PCV as well as GCV were observed for plant height, branches
per plant, seed yield, 100-seed weight, harvest index and seed yield per plant. Broad sense
heritability was high (>70%) for seed yield per plant followed by 100-seed weight, plant
height, harvest index, seed yield, pods per plant, branches per plant, protein content, cluster
per plant, biological yield, pods per cluster and days to 75 per cent maturity. Correlation
analysis revealed that seed yield had significant positive correlation with pods per plant,
clusters per plant and pods per cluster indicating that selection through these traits would be
effective. Path analysis revealed that seed yield, cluster per plant, pod per cluster, seeds per
pod, plant height, days of 50 per cent flowering, protein content, pods per plant, 100-seed
weight and number of branches as important traits for direct selection for yield. Genetic
diversity studies using Mahalanobis D2
-statistics grouped 36 adzuki bean genotypes into eight
clusters. Maximum genotypes were placed in cluster I (19 genotypes) followed by cluster II
(7 genotypes), cluster III, IV, V and cluster VI (2 genotypes each), cluster VII and VIII (1
genotype each). Among eight clusters, the highest intra cluster distance was observed for
cluster III . The highest inter-cluster distance was observed between cluster III and VIII
followed by VII and VIII . Cluster I and IV and Cluster II and III had the smallest cluster
distances, indicating that genotypes were less diverse than genotypes in the other clusters. The
high intra-cluster distances revealed that the lines within the same cluster were heterogeneous.
On the basis of mean performance, total of 6 genotypes i.e., EC030270, EC340265,
EC120460, EC340257, IC34957 and IC341947 have been identified superior for further
research purpose