Genetic Diversity Studies for Morphological Traits in Clusterbean (Cyamopsis tetragonoloba L.)
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Date
2016-08
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University of Agricultural Science, Dharwad
Abstract
Clusterbean genotypes collected from different regions of India were evaluated in agumented design, with three checks replicated in each block to study the genetic variability, genetic divergence, per se performance, correlation and path analysis at Floriculture unit, Department of Horticulture, University of Agricultural Sciences, Dharwad, during kharif 2015. Analysis of variance revealed highly significant (at P=0.01) difference among genotypes for all seventeen characters studied. Broad genetic base was evident as the value of genotypic and phenotypic coefficient of variance was high for plant height, Number of branches, pod length, pods per plant, no of seeds per pod, yield per plant and seed yield per hectare. High heritability coupled with genetic advance over mean was observed for plant height at 90 DAS, Number of branches, leaf area, pod length at 60 DAS, Number of pods per plant, Number of seeds per pod, seed yield per plant, vegetable pod yield per plant and total seed yield per hectare which indicated predominance of additive gene actions for these traits.
Correlation studies revealed significant and positive association of total seed yield per hectare with plant height, leaf area and Number of pods per plant. Path analysis for total seed yield per hectare revealed that secondary branches and days to 50 per cent flowering are being chief contributing characters at phenotypic level.
The genetic divergence studies using K-means statistics grouped thirty five genotypes of clusterbean into five groups. Maximum inter-cluster distance was between clusters I and III. Among the seventeen characters included in K-means analysis, total seed yield per hectare contributed maximum towards genetic divergence followed by seed yield per plant and pod yield per plant. A few of the most promising genotypes evolved from present study for vegetable pod yield and seed yield were GR-9, GR-4, GR-29 and GR-26.