Abstract
The current study is the first installment of an effort to explore the secondary gene pool for the enhancement of Upland cotton (Gossypium hirsutum L.) germplasm. We developed advanced-generation backcross populations by first crossing G. hirsutum cv. Tamcot 2111 and G. barbadense cv. Pima S6, then independently backcrossing F1 plants to the G. hirsutum parent for three cycles. Genome-wide mapping revealed introgressed alleles at an average of 7.3% of loci in each BC3F1 plant, collectively representing G. barbadense introgression over about 70% of the genome. Twenty-four BC3F1 plants were selfed to generate 24 BC3F2 families of 22–172 plants per family (totaling 2,976 plants), which were field-tested for fiber elongation and genetically mapped. One-way analysis of variance detected 22 non-overlapping quantitative trail loci (QTLs) distributed over 15 different chromosomes. The percentage of variance explained by individual loci ranged from 8% to 28%. Although the G. barbadense parent has lower fiber elongation than the G. hirsutum parent, the G. barbadense allele contributed to increased fiber elongation at 64% of the QTLs. Two-way analysis of variance detected significant (P<0.001) among-family genotype effects and genotype×family interactions in two and eight regions, respectively, suggesting that the phenotypic effects of some introgressed chromosomal segments are dependent upon the presence/absence of other chromosomal segments.
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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., Draye, X., Jiang, CX. et al. Molecular dissection of interspecific variation between Gossypium hirsutum and Gossypium barbadense (cotton) by a backcross-self approach: I. Fiber elongation. Theor Appl Genet 111, 757–763 (2005). https://doi.org/10.1007/s00122-005-2063-z
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DOI: https://doi.org/10.1007/s00122-005-2063-z