Cotton Genotype Responses to Suboptimal Temperature and Related Dyeing Characteristics

J.M. Bradow and P.J. Bauer


Six commercial cotton [Gossypium hirsutum] cultivars ['Deltapine 20', 'Deltapine 50', 'Deltapine 90', 'Deltapine 5690', 'Coker 315', and 'Paymaster 145'] and an F2 and F3 from Coker 315 and Paymaster 145 were planted in South Carolina during the second weeks in April and the first and third weeks of May in 1991 and 1992. The same genotypes were also subjected to laboratory seedling vigor tests at 15, 20, 25 and 30 C. Genotypic differences were observed in response to suboptimal temperatures and in yield. [See "Cotton Genotype Responses to Suboptimal Temperature: I and II," Bradow and Bauer, Proc. 1994 Beltwide Cotton Improvement Conference]. Yarns were spun from fiber of all eight genotypes and tested in the Mini-Spinning Lab at Southern Regional Research Center. Few significant genotypic differences were found in the yarn properties. Coker 315 showed a higher propensity for yarn neps in both years, and yarn neps were high in 1992 Paymaster 145 yarn. Deltapine 20 yarn strength AND g/tex were slightly lower than the average values across all genotypes. Greige and blue-dyed knitted fabrics from all genotypes were examined with the Hunter Colorimeter Testor Model D25-PC2. Color and dyeing variations were negligible except for some striations visible in some dyed Coker 315 fiber replicates. The striations correlated with variations in yarn evenness. There were no dye defects attributable to 'white specks' or to genotypic variations in fiber characteristics or response to growing environment.

Reprinted from Proceedings of the 1994 Beltwide Cotton Conferences pg. 1490
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998