Genetic variability, correlation and path coefficient analysis in Sub1 introgressed restorer lines of Rice (Oryza sativa L.)

The present study was conducted to assess the genetic variability parameters, correlation and path coefficient analysis for seven yield related traits in BILs (BC2F5) of an elite restorer KMR-3R and Swarna-Sub1 at ICAR-IIRR, Hyderabad during Kharif, 2020 and Rabi, 2021. The results indicated that, estimates of Phenotypic coefficient of variation (PCV) were higher than Genotypic coefficient of variation (GCV) for all the traits studied, suggesting that these traits were influenced by the environment. Single plant yield (SPY) and plant height (PH) showed moderate PCV, and GCV, high heritability [h2 (%)] and genetic advance as percent of mean (GAPM). Correlation and path coefficient studies showed that SPY was associated significantly positive with days to 50% flowering (DFF) and number of productive tillers (PT), high positive direct effect on single plant yield was recorded by number of productive tillers, days to 50% flowering and spikelet fertility [SF (%)]. These traits should be prioritized for the selection of the potential BILs of restorer for developing high yielding submergence-tolerant rice hybrids suitable for flood-prone areas.