ARS | Publication request: Determination of chromosome effects for cotton cultivars crossed with chromosome substitution lines and TM-1

Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Abstract Only
Publication Acceptance Date: January 9, 2007
Publication Date: June 25, 2007
Citation: Wu, J., Jenkins, J.N., McCarty Jr., J.C., Saha, S., Wallace, T. 2007. Determination of chromosome effects for cotton cultivars crossed with chromosome substitution lines and TM-1 [abstract]. National Cotton Council Beltwide Cotton Conference. p. 2115.

Technical Abstract: Determination of desirable chromosome effects associated with traits of interest in inbred lines or crosses will provide useful genetic information for crop improvement. In this study, using a recently developed genetic model, we analyzed the data set including 13 cotton chromosome substitution (CS-B) lines and their recurrent parent TM-1, five commercial cultivars, and their 75 F2 hybrids. The chromosome additive and dominance variance components for eight agronomic and fiber traits regarding 13 chromosomes or chromosome arms among these parents and their crosses were estimated. Chromosome additive effects among these parents regarding a specific chromosome or chromosome arm for a quantitative trait with a large contribution to the phenotypic variance (>20%) were predicted as well. Results showed that chromosome 16 in CS-B16 had additive effects associated with decreased seed cotton yield and lint yield while chromosome 16 in FM966 had additive effects associated with increased seed cotton yield and lint yield. Chromosome 25 in CS-B25 was associated with negative additive effect for micronaire, positive additive effects for 2.5% fiber span length and fiber strength. Chromosome 25 of FM966 had desirable additive effects for fiber length and strength. The results from this study should provide valuable genetic information for pure lines development with several improved traits such as yield and fiber strength.