Studies on Genetic Variability, Character Associations and Genetic Divergence in Rice bean [Vigna umbellata (Thunb.) Ohwi and Ohashi] Germplasm

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2015-06
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College of Forestry, Ranichauri Campus, V.C.S.G. Uttarakhand University of Horticulture and Forestry
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The present investigation was conducted during Kharif, 2014 at Research Block, Department of Crop Improvement, V. C. S. G. Uttarakhand University of Horticulture and Forestry, College of Forestry, Ranichauri Campus, Tehri Garhwal, Uttarakhand. The 28 diverse genotypes of rice bean including three checks viz., PRR-1, PRR-2 and BRS-1 were evaluated in Randomized Complete Block Design with three replications. The characters studied were days to 50 per cent flowering, days to maturity, plant height (cm), stem thickness (mm), pod length (cm), number of pods per plant, leaflet size (cm), number of primary branches, number of seeds per pod,100 seed weight (g) and seed yield per plant (g). The data was analyzed for estimation of mean, range, coefficients of variation, heritability and genetic advance, correlation coefficients, path coefficients and genetic divergence. The genotype exhibiting high mean performance for seed yield along with high performance for some other yield components were PRR-2, PRR-1, LRB 471, LRB 456, LRB 458 and LRB 472. High magnitudes of phenotypic and genotypic coefficients of variation were noticed for stem thickness and number of pods per plant. High estimates of heritability coupled with high genetic advance as per cent of mean were observed for stem thickness, pod length, 100 seed weight and seed yield per plant. Seed yield per plant exhibited very strong positive association with number of pods per plant, pod length, leaflet size, number of seeds per pod and number of primary branches at phenotypic and genotypic levels. Path-coefficient analysis identified number of pods per plant and leaflet size as major direct contributors towards seed yield per plant at genotypic and phenotypic levels. The twenty eight genotypes of rice bean were grouped into six clusters irrespective of geographical diversity, indicating no parallelism between geographic and genetic diversity. The cluster pairs exhibiting very high inter-cluster distances were cluster IV and V, cluster II and IV, cluster I and cluster IV and cluster III and IV. Considering cluster mean and genetic distance the crossing of entry of clusters IV with entries of cluster V and those of cluster II, I and III with the entries of cluster IV would be fruitful for obtaining transgressive segregants for developing high yielding and better quality rice bean varieties.
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