Genetic variability and character association among biometrical traits in F2 generation of some Rice crosses

Twenty five F2 progenies derived from the crosses involving HYV s and quality rices were evaluated during kharif 2005. Eleven biometrical characters were studied for estimating phenotypic variance, genotypic variance, genotypic coefficient of variation (GCV), phenotypic coefficient of variation (PCV), genetic advance, heritability (Broad sense), correlation coefficient and path coefficient among themselves. The analysis of variation revealed significant differences in the genotypes for all the characters studied. Per se performance of the progenies revealed that two F2 progenies derived from the crosses IR-62 x Samba Mashuri and Kunti x Dudheswar were promising in respect of grain yield and some yield related traits. High GCV and PCV were observed for grain yield plant -1, panicle number plant -1 and panicle weight. High heritability was observed against all the characters studied excepting panicle weight, grain number panicle -1 and grain breadth. Grain yield plant -1showed maximum genetic advance as percentage of mean followed by panicle number plant -1, plant height and panicle weight respectively. Grain yield plant -1 possessed significant positive correlation with panicle number plant -1, panicle weight and grain number panicle -1 while it had significant negative correlation with plant height. Panicle number plant -1 imparted maximum direct effect on grain yield followed by grain number panicle -1, 1000 grain weight and panicle length in this regard.