Estimation of Genetic Variability Parameters for Various Yield Attributing Traits in Germplasm Collection of Rice (Oryza sativa L.)

Abstract

Genetic variability parameters were studied in 2879 germplasm accessions of rice for 11 quantitative traits. Moderate value of genotypic coefficient of variation (GCV) and phenotypic coefficient variation (PCV) was observed for the traits, 100 seed weight, seedling height, L:B ratio, plant height, and number of effective tillers, whereas rest of the traits had low GCV and PCV values. High heritability was observed for all the traits except leaf length, leaf width and grain yield per plant. High heritability coupled with high genetic advance as percent of mean was observed for 100 seed weight, seedling height and L:B ratio. High heritability coupled with moderate genetic advance as percent of mean was recorded for days to 50% flowering and plant height. The presence of high heritability and high genetic advance as percent of the mean indicated the presence of additive gene effects for controlling aforesaid traits, hence selection in later generations will be rewarding in a breeding programme.