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ThesisItem Open Access Studies on in vitro regeneration of panicum sumatrence using mature seed and leaf base explant(Jawaharlal Nehru Krishi Vishwa Vidyalaya Jabalpur, 2017) Mishra, Monika; Tiwari, SharadThesisItem Open Access Genetic Variability, Correlation and Path analysis for Yield and its Components in Cowpea [Vigna unguiculata (L.)](JNKVV, 2013) Mishra, Monika; Sengupta, S.K.ABSTRACT A field experiment was conducted at the Vegetable Research Farm, Department of Horticulture, College of Agriculture, J.N.K.V.V., Jabalpur (M.P.) with sixteen (16) genotypes of cowpea [Vigna unguiculata (L.)]”, raised in Randomized Block design with three replications during 2012. The variability existing for characters in genotypes were statistically assessed. Their heritability and genetic advance were worked out. The correlation of seed yield with its component characters and among the components was examined. The magnitude of influence of the characters on pod yield was worked out through path analysis. On the basis of results, the present investigation is summarized as follows: The analysis of variance showed significant differences among the genotypes for all the characters studied. The plant height followed by number of branches per plant at 90 DAS, pod weight and number of pods per plant had high phenotypic and genotypic coefficient of variation values suggesting that these characters are under the influence of genetic control. The characters plant height, days to first flowering, days to 50% flowering, days to first picking and pod weight showed least differences among PCV and GCV estimates indicating greater role of genetic factors influencing the expression of these characters. Whereas, the influence of environment was more on the characters number of branches per plant, number of pods per plant and pod yield per plant. The heritability estimates were high for the characters, plant height at 60 DAS, plant height at 90 DAS, pod weight, number of branches per plant at 90 DAS, pod length, plant height at 30 DAS, days to 50 per cent flowering, number of flower per cluster, days to first flowering, number of seeds per pod and pod width. Pod yield per plant, number of pods per plant, days to first flowering, days to 50 per cent flowering, plant height at 90 DAS and pod length have high values of heritability coupled with high genetic advance as per cent of mean indicating lesser influence of environment on these characters and prevalence of more additive gene action in their inheritance, hence, are amenable for simple selection. Low estimates of heritability coupled with low genetic advances as percentage of mean were displayed by pod yield per ha. Association analysis revealed high significant positive correlation of pod yield per plant with number of pods per cluster, pod weight and number of pods per plant. The days to 50 per cent flowering, days to first picking and number of pods per plant and pod length and pod weight recorded positive inter-correlation among themselves, indicating the possibility of simultaneous improvement of these traits by selection programme. Path coefficient analysis revealed a higher magnitude of positive direct effects of plant height at 90 DAS on pod yield per plant followed by pod weight, days to 50 per cent flowering, number of flower per cluster, days to first picking, pod width and number of seeds per pod. It was found that Genotype 2011/COPBVAR – 7 is most suitable for further improvement in Jabalpur condition.