Combining ability estimates from line x tester mating design in upland cotton
2008
Panhwar, S.A. (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) | Jatoi, W.A. (Sindh Agriculture Univ., Tandojam (Pakistan). Dept. of Plant Breeding and Genetics) | Veesar, N.F. | Majeedano, M.S.
Combining ability estimates are important genetic attributes to cotton breeders in predicting improvement via hybridization and selection programmes. Line x tester analysis involving five cotton leaf curl virus resistant female lines and three testers, was carried out to study five yield related traits in upland cotton. The significance of GCA and SCA variances was evident from mean squares of all the five traits indicating that additive as well as non-additive genes controlled the traits. However, among the five female lines, CIM-707 showed maximum GCA effects for number of bolls, seed cotton yield and seed index, while female lines FH-1000 and FH-925 were good general combiner for GOT% (1.760) and boll weight (0.340) respectively. The next high GCA scoring parent for seed cotton yield (4.016) nevertheless was CIM-499. Among the testers, parent CRIS-134 was desirable as it manifested higher estimates of GCA effects for all the characters except seed index. The GCA estimates as a whole suggested that if most of the traits are to be improved through hybridization and selection, then priority should be given to parents CRIS-134 from among the testers and CIM-707 and FH-1000 from among the female lines. The hybrid CIM-707 x CRIS-134 exhibited maximum SCA effect for number of bolls per plant; CIM-707 x CRIS-377 for seed cotton yield; FH-1000 x CRIS-342 for boll weight and GOT% and FH-1000 x CRIS-377 for seed.
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