Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Abstract Only
Publication Acceptance Date: October 2, 2006
Publication Date: January 12, 2007
Citation: Hinze, L.L., Yu, J., Kohel, R.J. 2007. Analysis of fiber quality traits in a seven-parent upland cotton diallel [abstract]. In: Proceedings of Beltwide Cotton Conferences, January 9-12, 2007, New Orleans, Louisiana. Paper No. 6497. Technical Abstract: In addition to raising yields, improving the quality of cotton (Gossypium hirsutum L.) fiber has become an increasingly important component of the value of cotton, especially for marketing in the international trade. The objectives of this study were to identify sources of variation for fiber quality while evaluating the combining ability of seven sources of Upland cotton. Seven parents (TM1, 7235, SG125, Fibermax832, CAMD-E, MD51, and DPL50) were selected to represent a range in fiber quality and productivity, and they were crossed in a half-diallel design to develop F2 populations. Fiber quality traits including strength, length, micronaire, elongation, and uniformity ratio were measured on 200 individual plants in each of the 21 F2 populations and their parents. Results of the phenotypic analysis show that there are significant differences among the parents and among the F2 populations for all fiber traits. Within the F2 populations, there is also a range of variation in trait scores across the 200 individuals. In many populations, several individuals are transgressive segregates whose trait scores exceed the value of their parents. Line 7235 had the best general combining ability for all traits except elongation. Line 7235 in combination with other parents was also frequently identified as having good specific combining ability. Overall, line 7235 appears to provide a range of variation and higher values for fiber quality traits that could be useful both in identifying regions of the genome specific for fiber quality traits and in identifying parents for a breeding program.