Genetic Variability and Heritability Study in Double Cross F2Linesof Cotton (G. hirsutum L.)

Abstract

An effective breeding programme requires precise information regarding the degree of link between different genotypes. The difference in gene frequencies between populations is represented by genetic variability. Genetic diversity was thought to be a key factor in achieving heterotic responses in F1 and a wide range of variability in segregating generations. As a result, any breeding effort must have information on the estimates of variability in yield and its heritable components in the material with which the breeder is working. As a result, using genetic parameters like genotypic coefficient of variation (GCV), phenotypic coefficient of variation (PCV), heritability (h2), and genetic advance as a percent of mean (GAM). It becomes important to divide total variability into heritable and non-heritable components. Attempts were made to take use of the heterogeneity seen in segregating cotton generations through the current study. In Kharif 2016, at Botany Garden UAS, Dharwad, 80 Double Cross F2lines from staygreen (SG) and high relative growth rate (high RGR) heterotic groups of cotton were assessed in a Randomized Block Design with two replications. With the exception of inter-boll distance, which helps in the selection and identification of beneficial transgressive segregants, RBD analysis lines in the DCF2 generation revealed substantial variations for every character.