Population Analysis of Some Agronomic and Technological Characteristics of Upland Cotton (Gossypium hirsutum L.), Using Diallel Analysis

Significant differences among hybrids and their parents were noted in number of bolls per plant, seeds per boll and lint percentage (GOT), exposed additive type of gene influence while Vr/Wr graphs indicated over-dominance type of gene action for seed cotton yield per plant. The non-significant deviation of regression line from unit slope indicates the absence of non-allelic interaction in number of bolls per plant, yield of seed cotton and seeds per boll showing absence of epistasis which provides positive out lines for isolating superior genotypes. The significant deviation from unit slope indicates the presence of epistasis in lint percentage (GOT) which confirmes its less effectiveness from selection point of view.