Coefficient of variation (GCV & PCV), heritability and genetic advance analysis for yield contributing characters in rice (Oryza Sativa L.)

Genetic variability studies provide basic information regarding the genetic properties of the population based on which breeding methods are formulated for further improvement of the crop. The estimates of heritability, coefficients of variability and genetic advance computed for 12 yield contributing traits. Genetic parameters for yield and its correspondent characters in rice were estimated from a trial with four CMS lines, fifteen testers, three checks and sixty crosses evaluated for twelve characters related to yield. In general, the magnitude of phenotypic coefficient of variation (PCV) was higher than the corresponding genotypic coefficient of variation (GCV) for all the traits. High estimates of heritability and genetic advance in broad sense and narrow sense were recorded for all characters viz., spikelet fertility, days to 50% flowering, days to maturity, spikelets per panicle, harvest-index, L/B ratio, 1000-grain weight, plant height, grain yield per plant, biological yield per plant, panicle bearing tillers per plant, panicle length. High heritability coupled with high genetic advance in percent of mean was observed for all the traits.