title: QTL analysis of cotton fiber length in advanced backcross populations derived from a cross between Gossypium hirsutum and G. mustelinum.
abstract: QTLs for fiber length mapped in three generations of advanced backcross populations derived from crossing Gossypium hirsutum and Gossypium mustelinum showed opportunities to improve elite cottons by introgression from wild relatives. The molecular basis of cotton fiber length in crosses between Gossypium hirsutum and Gossypium mustelinum was dissected using 21 BC3F2and 12 corresponding BC3F2:3and BC3F2:4families. Sixty-five quantitative trait loci (QTLs) were detected by one-way analysis of variance. The QTL numbers detected for upper-half mean length (UHM), fiber uniformity index (UI), and short fiber content (SFC) were 19, 20, and 26 respectively. Twenty-three of the 65 QTLs could be detected at least twice near adjacent markers in the same family or near the same markers across different families/generations, and 32 QTLs were detected in both one-way variance analyses and mixed model-based composite interval mapping. G. mustelinum alleles increased UHM and UI and decreased SFC for five, one, and one QTLs, respectively. In addition to the main-effect QTLs, 17 epistatic QTLs were detected which helped to elucidate the genetic basis of cotton fiber length. Significant among-family genotypic effects were detected at 18, 16, and 16 loci for UHM, UI, and SFC, respectively. Six, two, and two loci showed genotype × family interaction for UHM, UI and SFC, respectively, illustrating complexities that might be faced in introgression of exotic germplasm into cultivated cotton. Co-location of many QTLs for UHM, UI, and SFC accounted for correlations among these traits, and selection of these QTLs may improve the three traits simultaneously. The simple sequence repeat (SSR) markers associated with G. mustelinum QTLs will assist breeders in transferring and maintaining valuable traits from this exotic source during cultivar development.
authors.affiliation: Plant Genome Mapping Laboratory, University of Georgia, 111 Riverbend Road, Athens, GA, 30602, USA.|School of Life Sciences, Nantong University, Nantong, 226019, Jiangsu, China.|Department of Crop and Soil Sciences, University of Georgia, 2356 Rainwater Road, Tifton, GA, 31793, USA.
authors.forename: Baohua
authors.identifier: http://orcid.org/0000-0001-7449-8292
authors.initials: B
authors.lastname: Wang
authors.affiliation: Université catholique de Louvain, Place Croix du Sud 2/11, 1348, Louvain-la-Neuve, Belgium.
authors.forename: Xavier
authors.initials: X
authors.lastname: Draye
authors.affiliation: School of Life Sciences, Nantong University, Nantong, 226019, Jiangsu, China.|Department of Crop and Soil Sciences, University of Georgia, 2356 Rainwater Road, Tifton, GA, 31793, USA.
authors.forename: Zhimin
authors.initials: Z
authors.lastname: Zhuang
authors.affiliation: Plant Genome Mapping Laboratory, University of Georgia, 111 Riverbend Road, Athens, GA, 30602, USA.|Engineering Research Center of South Upland Agriculture, Ministry of Education, Southwest University, Chongqing, 400716, China.
authors.forename: Zhengsheng
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Plant Genome Mapping Laboratory, University of Georgia, 111 Riverbend Road, Athens, GA, 30602, USA.
authors.forename: Min
authors.initials: M
authors.lastname: Liu
authors.affiliation: Department of Crop and Soil Sciences, University of Georgia, 2356 Rainwater Road, Tifton, GA, 31793, USA.
authors.forename: Edward L
authors.initials: EL
authors.lastname: Lubbers
authors.affiliation: Cotton Incorporated, Cary, NC, 27513, USA.
authors.forename: Don
authors.initials: D
authors.lastname: Jones
authors.affiliation: Department of Crop and Soil Sciences, University of Georgia, 2356 Rainwater Road, Tifton, GA, 31793, USA.|Monsanto Cotton Breeding, Tifton, GA, 31793, USA.
authors.forename: O Lloyd
authors.initials: OL
authors.lastname: May
authors.affiliation: Plant Genome Mapping Laboratory, University of Georgia, 111 Riverbend Road, Athens, GA, 30602, USA. paterson@uga.edu.
authors.forename: Andrew H
authors.initials: AH
authors.lastname: Paterson
authors.affiliation: Department of Crop and Soil Sciences, University of Georgia, 2356 Rainwater Road, Tifton, GA, 31793, USA. pwchee@uga.edu.
authors.forename: Peng W
authors.initials: PW
authors.lastname: Chee
mesh_terms: D000483:Alleles; D002874:Chromosome Mapping; D032561:Cotton Fiber; D003433:Crosses, Genetic; D004843:Epistasis, Genetic; D005819:Genetic Markers; D005838:Genotype; D003368:Gossypium / Q000235:genetics*; D018895:Microsatellite Repeats; D010641:Phenotype; D000069600:Plant Breeding; D040641:Quantitative Trait Loci
chemical_list: D005819:Genetic Markers