Abstract
The experiment was laidout in randomized complete block design with four replications in the experimental field of Botanical Garden, Department of Plant Breeding and Genetics, Sindh Agriculture University, Tandojam for assessing the gene action for quality traits in a 5x5 complete diallel cross having five varieties of Gossypium hirsutum L. The genetic components of variance revealed that dominance components (H1 and H2) and additive component (D) were highly significant for all the traits except staple length in dominance components. It was further observed that dominance components were greater in magnitude than additive components. The average degree of dominance for lint index, GOT%, staple length and fibre strength were more than a unity, displaying over dominance type of gene action, the positive non-significant F-value revealed that the dominant genes were less frequent than recessive genes in the parents and that they were in decreasing position as exhibited by h2 value. Estimated ratio of h2/H2 indicated that there were at least one group of genes controlling GOT%, two group of genes controlling lint index and fibre strength and three group of genes controlling staple length. —————————— ——————————
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