Genetic variability and correlation studies of different rice (Oryza sativa L.)genotypes under aerobic condition

Abstract

Nineteen rice (Oryza sativa L.) genotypes along with two checks were evaluated for yield and its attributingtraits under aerobic condition to study genetic variability parameters and correlation among its component traits duringkharif 2021 by taking mean values of characters across six environments under aerobic condition. For all of the yield andyield contributing traits, variance tests revealed incredibly substantial significant differences between all of the rice(Oryza sativa L.) genotypes for all the characters studied, indicating the presence of a variable amount of genetic variability.High values of GCV and PCV were observed for the characters viz., number of panicles sqm-1, grain yield plant-1, numberof productive tillers panicle-1, grain breadth (mm) indicating huge amount of variation within these characters. ModerateGCV and PCV values were observed for the characters viz., plant height, number of tillers bearing panicle, L/B ratio,biomass and grain length indicating moderate genetic variability within these characters. High GCV and PCV values coupledwith high heritability and high genetic advance over mean were observed for the characters viz., number of panicles sqm-1,grain yield plant-1, number of productive tillers panicle-1indicating the lesser influence of environment on the expression ofthese characters and are also governed by additive genes which provides perfect criteria for selection of these characters forfurther improvement. Correlation studies suggests the characters viz., panicle length, number of panicles sqm-1, grain yieldplant-1, number of productive tillers panicle-1, grain breadth (mm), grain breadth, L/B ratio, test weight, biomass and spikeletfertility had significant and positive correlation with grain yield indicating indirect selection of these characters could beperfect criteria for the genetic improvement of particular genotype during breeding programme.