Abstract
Thirty F1 rice hybrids along with complete set of 13 parents and checks were evaluated for variability, heritability and genetic advance in different yield and yield contributing traits. The data was recorded on five randomly selected plants for fifteen quantitative characters. The treatment, i.e. mean sum of squares due to genotypes showed significant differences for 14 characters studied, indicating the presence of high genetic variability among the genotypes. The estimates of GCV were lower than the respective PCV, indicating the influence of environmental factors on the expression of the traits studied. Characters like percent pollen fertility (99.9, 33.33), grain yield hill-1 (99.2, 31.13), harvest index (98.5, 30.42) and number of filled grains panicle-1 (97.8, 30.04) showed high heritability coupled with moderate genetic advance as percent of mean, suggesting that selection for the improvement of these characters may be rewarding. This also indicates greater role of non-additive gene action in their inheritance suggesting heterosis breeding could be used to improve these traits.
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