An experiment was carried out to estimate the variability parameters for yield and yield attributed characters in 40 rice genotypes which are derived in the background of BPT-5204. Analysis of variance (ANOVA) revealed the existence of significant differences among genotypes for all traits studied. Genotypic coefficient of variation played a major role for the expression of the traits and ranged from 2.63 (Days to 50% flowering) to 47.32 (Un-filled grain number per panicle). The difference between values of phenotypic and genotypic variances along with their co

Genetic advance, Genetic variability, Direct seeded rice (Oryza sativa L.), BPT-5204 derived genotypes.

rresponding PCV and GCV for yield related traits was insignificant indicating low sensitivity to environment consequently higher role of genetic factors influencing the trait expression. Heritability ranged from 34.33 (Days to 50% flowering) to 95.00 (Un-filled grain number per panicle). High heritability coupled with high genetic advance as percent of mean was found for shoot biomass (80.51 and 64.72), root biomass (84.52 and 64.85), grain filling duration (80.83 and 24.39), tiller number per plant (91.43 and 49.47), panicle number per plant (85.42 and 50.70), flag leaf length (79.52 and 25.56) and test weight (64.63 and 37.87) indicated that high response to selection for these traits. On the basis of mean performance, the highest grain yield per plant was observed for the genotype 16KDSBPT-8 (38.59 g) and was found 10.37% superior in grain yield than BPT-5204 (28.23 g) followed by 16KDSBPT-21 (38.02 g) and 16KDSBPT-27 (37.79 g) which found 9.79% and 9.56% superior in yield than BPT-5204.

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