Genetic analysis of high: Temperature stress on rice plant and its traits related to yield

In the present investigation, eighty-seven rice genotypes were assessed for genetic variability and correlations between yield and yield components in summer season. Analysis of variance revealed that existence of significant difference for all the traits under study, indicating the presence of sufficient amount of variability. Highest PCV and GCV were recorded for filled grains per panicle followed by grain yield per plant, total grains per panicle and biological yield per plant. High heritability coupled with high genetic advance as percent of mean was found in days to 50% flowering followed by flag leaf area, total grains per panicle and filled grains per panicle. Grain yield per plant exhibited positive and highly significant correlation with biological yield per plant, filled grain per panicle, tillers per plant, effective tillers per plant, total grains per panicle, spikelet fertility and harvest index. Selection of plants on the basis of these traits would certainly lead to improvement in grain yield.