Abstract
A backcross-self population from a cross between Gossypium hirsutum and G. barbadense was used to dissect the molecular basis of genetic variation governing 15 parameters that reflect fiber length. Applying a detailed restriction fragment length polymorphism (RFLP) map to 3,662 BC3F2 plants from 24 independently derived BC3 families, we detected 28, nine, and eight quantitative trait loci (QTLs) for fiber length, length uniformity, and short fiber content, respectively. For eight, six, and two chromosomal regions containing quantitative trait loci (QTLs) for fiber length, length uniformity, and short fiber content (respectively), two-way analysis of variance showed a significant (P<0.001) among-family genotypic effect. A total of 13, two, and four loci showed genotype × family interaction, illustrating some of the complexities that are likely to be faced in introgression of exotic germplasm into the gene pool of cultivated cotton. Co-location of many QTLs for fiber length, length uniformity, and short fiber content accounted for correlations among these traits, while the discovery of many QTLs unique to each trait suggests that maximum genetic gain will require breeding efforts that target each trait (or an index including all three). The availability of DNA markers linked to G. barbadense QTLs identified in this and other studies promise to assist breeders in transferring and maintaining valuable traits from exotic sources during cultivar development.
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Acknowledgements
We acknowledge the financial support from the Texas and Georgia Agricultural Experiment Stations, Texas Higher Education Coordinating Board, Cotton Incorporated, and USDA-IFAFS. XD was a postdoctoral research associate of the Fonds National Belge de la Recherche Scientifique.
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Chee, P.W., Draye, X., Jiang, CX. et al. Molecular dissection of phenotypic variation between Gossypium hirsutum and Gossypium barbadense (cotton) by a backcross-self approach: III. Fiber length. Theor Appl Genet 111, 772–781 (2005). https://doi.org/10.1007/s00122-005-2062-0
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DOI: https://doi.org/10.1007/s00122-005-2062-0