Diallel analysis for estimating combining ability in upland cotton (Gossypium hirsutum L.)
2008
Kumboh, N. (Sindh Agriculture Univ., Tandojam (Pakistan). Dept. of Plant Breeding and Genetics) | Baloch, M.J. (Sindh Agriculture Univ., Tandojam (Pakistan). Dept. of Plant Breeding and Genetics) | Kumbhar, M.B. (Sindh Agriculture Univ., Tandojam (Pakistan). Dept. of Plant Breeding and Genetics) | Khanzada, S. | Jatoi, W.A.
Combining ability estimates are very important genetic attributes to cotton breeders in predicting improvement that could be envisaged from hybridization and selection programmes. The crosses were attempted in half diallel fashion, which involved four parents during, crop season 2006. The mean squares due to general combining ability (GCA) and specific combining ability (SCA) were significant for seven out of nine characters studied. The significance of GCA and SCA variances suggested that both additive and non-additive genes were controlling the characters, yet non-additive genes were more important because variances due to SCA were generally higher than due to GCA. The general combining ability (GCA) estimates indicated that parent FH-901 showed maximum effects for plant height, number of bolls, boll weight, seed cotton yield and GOT%. Nonetheless, parent CIM-506 displayed maximum GCA for number of sympodial branches and earliness while CIM-499 and BH-160 showed maximum GCA effects for fibre length and micronaire, respectively. The specific combining ability (SCA) effects indicated that hybrid, CIM-506 x FH-901 showed highest positive SCA for plant height and CIM-506 x CIM-499 for number of sympodial branches, number of bolls per plant, GOT% and earliness, while FH-901 x CIM-499 gave maximum SCA effects for seed cotton yield per plant.
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