Author(s):

Vinoth K, Padmapriya S, Rajamani K and Gnanam R

Abstract: The current investigation was conducted to estimate genetic parameters such as genotypic coefficient of variation (GCV), phenotypic coefficient of variation (PCV), heritability and genetic advance (GA) along with correlation and path coefficient from the data collected on fifty veldt grape ecotypes during 2018-20. High estimates (>35%) of GCV and PCV for number of matured leaves, number of twiners, number of primary roots and plant height indicated the presence of adequate genetic variation among the genotypes and suitability of these attributes for further improvement by selection. Correlation and path coefficient analysis among fourteen morphological characters studied in fifty veldt grape ecotypes indicated higher genotypic correlation coefficients than the corresponding phenotypic correlation coefficient, suggesting that the environmental influence reduces the relationship between stem yield and stem yield contributing characters of veldt grape. All the genetic parameters are positively and significantly correlated with stem yield, except days taken for rooting where it is negatively correlated in both genotypic and phenotypic correlation coefficients, number of twiners (0.97^**) are positively and significantly correlated with plant height in the genotypic correlation. Root weight is positively and significantly correlated with number of primary roots (0.88^**) and root length (0.87^**) in genotypic correlation. Number of twiners are positively and significantly correlated with plant height (0.51^**) in phenotypic correlation coefficients. Days taken for rooting is negatively correlated with root weight (-0.37), number of lateral roots (-0.31) and root length (-0.28) in phenotypic correlations coefficients. Path coefficient analysis revealed direct positive effect of number of lateral roots (1.24) and root length (0.56) on stem yield. The number of lateral roots and root length had the highest positive direct effect on stem yield and positive significant genotypic correlation between these two traits indicating that direct selection through these traits would be much effective for the yield improvement of Cissus ecotypes.

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