GENETIC PARAMETERS AND ASSOCIATION STUDIES FOR YIELD AND YIELD CONTRIBUTING TRAITS AMONG PARENTS AND ITS HYBRID IN RICE (Oryza sativa L)

In existing experiment, eighteen crosses along with nine parents were evaluated for genetic parameter and association study for identification yield contributing traits. The analysis of variance was showed that the huge amount of variability is present between parents and their hybrids for all traits. The PCV is greater than GCV revealing the little influence the environment on character expression (ECV) for most of the traits except hundred grain weight (1.11) and grain yield (1.23). The high magnitudes of phenotypic and genotypic coefficient of variation were recorded for the traits viz., grain yield per plant (69.94% and 71.52%), effective tillers (68.15% and 68.36%), total tillers (58.08% and 58.86%) and flag leaf width (29.30% and 29.42%). The high value of heritability along with high genetic advance were recorded for days to 50% flowering, flag leaf length, plant height, effective tillers, grain yield, panicle length and flag leaf width. Generally, phenotypic correlations are found higher than corresponding phenotypic and environmental correlation owing to modified cause of environment traits by which associated at genetic level. Grain yield per plant exhibited highly significant and positively associated with tiller per plant at genotypic (0.599), phenotypic (0.606) and environmental (0.646) level, effective tiller per plant at genotypic (0.730), phenotypic (0.734) and environmental (0.824) level. Decorticated grain breadth was found positive and significant correlation at environmental (0.620) level at 1% level of probability. This indicates that the relative utility of these traits for selection with respect to grain yield