Analysis of Genetic Variability for Grain Yield and Its Attributing Traits of Maize (Zea mays L.) Inbred Lines

Abstract

Forty-two inbred lines were planted in Randomized Block Design with three replications to check variability, heritability and genetic advance as percent of mean for grain yield and its attributing traits during Kharif 2021 at Research Farm, CCS HAU, RRS Uchani, Karnal. Understanding maize variability, heritability and genetic advance is critical for effective plant breeding and genetic improvement program. Analysis of variance revealed highly significant differences for all studied traits. Genotypic and phenotypic coefficient of variation was highest with small difference for grain yield per plant and its component traits indicating higher influence of environment on the expression of the traits. Highest broad sense heritability (%) was reported by lysine percent followed by tryptophan percent, cob diameter, days to silking, shelling percent and days to anthesis. High heritability coupled with high genetic advance as percent of mean was found in lysine percent followed by cob diameter, tryptophan percent, ear height, plant height and 100 grains weight number of grains per cob and number of kernels per row which indicates effectiveness of selection due to preponderance of additive gene action and breeder may consider these traits as primary selection criteria.