Combining ability is an important genetic attributes to cotton breeders in anticipated improvement via hybridization and selection. Seven parents were involved in a half diallel mating design which was analyzed by genotype × environment interaction (GGE) biplot graphical method. General combining ability (GCA) and specific combining ability (SCA) effects were significant for all traits. None of the parents were found to be a good combiner for all traits. The combinations of Giza 75 x Sea, 10229 x Giza 86 and Giza 86 had the best SCA for seed cotton yield/plant, lint percentage and boll weight, respectively. The graphical demonstration proposed by the biplot analysis provided an effective overview of GCA and SCA effects and mean performances in crosses. In addition, the biplot also provided an opportunity for assessing the interrelationship among the genotypes.
Key words: Cotton, diallel, biplot, correlation, general combining ability, specific combining ability.
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