RÉSUMÉ
The present investigation was conducted to estimate genetic variability parameters such as genotypic coefficient of variation (GCV), phenotypic coefficient of variation (PCV), heritability (h2) and genetic advance (GA) along with correlations and path coefficients from data collected on 40 F4-F5 population derived from a cross between aerobic restorer AR 9-18 and blast resistant donor MSM 1212 possessing Pi54. Analysis of variance indicated significant differences among the genotypes for all the characters studied. Moderate GCV and PCV was observed for number of productive tillers per plant, number of grains per panicle, per day productivity and single plant yield. High heritability coupled with high genetic advance as percent of mean were observed for number of productive tillers per plant, number of grains per panicle, per day productivity and single plant yield, whereas high heritability coupled with moderate genetic advance as percent of mean were observed for panicle length, spikelet fertility, thousand grain weight and plant height. Grain yield per plant showed positive correlation with per day productivity, days to 50% flowering, panicle length, number of productive tillers per plant, thousand grain weight and spikelet fertility, while, negative association with number of grains per panicle and plant height. The trait per day productivity had highest direct effect on single plant yield followed by days to 50% flowering, panicle length, number of productive tillers per plant, thousand grain weight, spikelet fertility (%). Hence, per day productivity and number of productive tillers per plant are identified as key traits for developing high yielding genotypes of rice for future breeding programme.
RÉSUMÉ
The present investigation was conducted to study the genetic variability, correlation and path coefficient analysis for eight yield and yield attributing traits in 47 (40 improved parental lines + 7 checks) lines of rice. Analysis of variance revealed significant differences among all the treatments under study. High values of PCV and GCV were recorded for traits like number of filled grains per panicle and single plant yield while moderate PCV and GCV recorded for plant height, number of productive tillers per plant, spikelet fertility and 1000 grain weight. High heritability coupled with high genetic advance as percent of mean was observed for the traits namely number of filled grains per panicle, plant height and single plant yield. The traits viz., productive tillers per plant, panicle length, number of filled grains per panicle, spikelet fertility % and 1000-grain weight exhibited significant and positive association with single plant yield. Number of filled grains per panicle, 1000-grain weight, number of productive tillers per plant, plant height and panicle length exhibited positive direct effect on single plant yield indicating that direct selection for these traits would lead to improvement in single plant yield.