Combining Ability of Ginning Rate and Net Ginning Energy Requirement in Upland Cotton
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Crop Science Society of America | 5585 Guilford Rd., Madison, WI 53711 USA All rights reserved. Combining ability describes the breeding value of parental lines to produce hybrids. The objectives of this study were to estimate specific (SCA) and general combining ability (GCA) for ginning rate and net ginning energy requirement in a set of upland cotton (Gossypium hirsutum L.) germplasm. Ginning efficiency was based on measurements of ginning energy (watt hour [Wh] kg1 lint) and ginning rate (g lint s1). There is little information in the scientific literature on this topic. Crosses were made in a 5 8 factorial design between five female and eight male diverse cotton genotypes. The experiment was conducted in a randomized complete plot design. Analysis of variance was performed using a mixed model of the GLM procedures. Even though the study indicated the presence of both additive (GCA) and nonadditive (SCA) genes controlling these traits, a preponderance of the GCA effects was evident. The cotton genotype MD 25 had the highest GCA effect for ginning rate, and AR 9317-26 had the highest significant negative GCA effect for net ginning energy. For lowering fuzz percentage, any of the seminaked seed lines (AR 9317-26, Tejas NS, SC 9023 NS) can be exploited. This study and other previous studies showed significant positive correlation of fuzz percentage with net ginning energy. For cultivar development, cross JJ 1145ne SC 9023 NS may be used for improving ginning rate, crosses FM 832 Tejas NS and JJ 1145ne SG 747 can be used for reducing fuzz percentage, and the hybrid Phytogen 72 TAM 98-99ne can be exploited for improving all three traits.
