Genetic effects on morphological and yield traits in cotton (Gossypium hirsutum L.)

摘要

The nature and magnitude of genetic effects on morpho-yield traits were studied in a 6 × 6 F1 and F2 diallel cross in upland cotton. An additive-dominance model was adequate for most of the traits except plant height and seed cotton yield, where the model was partially adequate. Genetic parameters were estimated following Hayman’s and Mather’s model. Additive effects controlled lint percentage and monopodia in both generations, and plant height and sympodia in F2. Non-additive inheritance with over-dominance controlled yield in both generations, and plant height and sympodia in F1. Most traits presented an unequal proportion of positive (U) and negative (V) alleles in the loci (H2