Evaluation on genetic variability and trait association in naturally coloured cotton (Gossypium hirsutum L.)

Abstract

A study was carried out to understand the genetic variability and trait association in a set of 30 naturally coloured cotton hybrids along with their parents (five colour cotton and six white cotton parents). The Analysis of Variance revealed the significance of the mean square for most of the traits studied. The phenotypic coefficient of variation was more than that of the genotypic coefficient of variation for all the traits. High PCV and GCV were recorded for the traits number of monopodia and single plant yield. The heritability and genetic advance as percentage of mean (GAM) were high for the traits plant height, number of monopodia, number of bolls per plant, single boll weight, bundle strength, fibre fineness and single plant yield. The Number of sympodia, number of bolls per plant and boll weight were observed to have significant genotypic and phenotypic correlation with single plant yield, while upper half mean length was observed to have significant genotypic and phenotypic correlation with bundle strength and fibreelongation. Path analysis revealed that seed index and ginning out turn recorded very high direct effect with single plant yield.

Keywords

• colour cotton
• gcv
• pcv
• heritability
• correlation
• path analysis