Studies on genetic variability, heritability and genetic advance for quantitative traits and nutritional traits in rice (Oryza sativa L.)

Fifty selected rice genotypes including two checks were evaluated during Kharif, 2022-23 for genetic variability, heritability and genetic advance as per cent of mean for 16 yield and its attributing traits along with six nutritional parameters in Ranadevi Post Graduate Research Farm, M. S. Swaminathan school of Agriculture, Centurion University of Technology and Management. Analysis of variance indicated highly significant differences among the 50 genotypes studied indicating that substantial variability is present among the genotypes. Total grains panicle-1, filled grains panicle-1, test weight, grain yield plant-1, straw yield plant-1, biological yield plant-1, protein content and mineral contents of Fe, Zn, Cu and Mn exhibited high genotypic coefficient of variation (GCV) and phenotypic coefficient of variation (PCV) suggesting that there is considerable genetic variability among the genotypes studied for the evaluated traits. All 22 traits showed a high heritability (broad sense) coupled with high genetic advance as percent of mean except panicle length, spikelet fertility, harvest index and carbohydrate content, which recorded moderate genetic advance as percent of mean, indicating that additive gene action operates for these traits and has potential for improvement through direct selection methods.