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Linkage disequilibrium and association mapping of fibre quality traits in elite Asiatic cotton (Gossypium arboreum) germplasm populations

Czech Journal of Genetics and Plant Breeding, 2017-01, Vol.53 (4), p.159-167 [Peer Reviewed Journal]

2017. This work is published under https://www.agriculturejournals.cz/web/about/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;ISSN: 1212-1975 ;EISSN: 1212-1975 ;DOI: 10.17221/142/2016-CJGPB

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  • Title:
    Linkage disequilibrium and association mapping of fibre quality traits in elite Asiatic cotton (Gossypium arboreum) germplasm populations
  • Author: SETHI, Khushboo ; SIWACH, Priyanka ; VERMA, Surender Kumar
  • Subjects: Admixtures ; Cotton ; Gene mapping ; general linear model ; Genetic distance ; Genetic diversity ; Genotypes ; Germplasm ; Gossypium arboreum ; Linkage disequilibrium ; Mapping ; Markers ; mixed linear model ; Population structure ; Population studies ; simple sequence repeat ; Structural analysis
  • Is Part Of: Czech Journal of Genetics and Plant Breeding, 2017-01, Vol.53 (4), p.159-167
  • Description: Cotton productivity has been hindered by the narrow genetic base of cultivated cotton. Linkage disequilibrium-based association mapping has become a powerful molecular tool to dissect and exploit genetic diversity. In the present study, population structure and marker-trait associations for fibre quality traits in genotypes belonging to six races of Gossypium arboreum were assessed. Out of 300 simple sequence repeat (SSR) markers, 100 were found polymorphic, yielding a total of 240 alleles (all polymorphic). Structure analysis revealed allelic admixtures between genotypes. A Q-matrix exhibited mixed ancestry for the majority of genotypes, the race indicum forming a significant percent ancestry for almost all genotypes. At significant threshold values of r2 ≥ 0.05, 7.37% of SSR loci showed significant linkage disequilibrium (LD), while at highly significant threshold of r2 ≥ 0.1, the value was reduced to 5.31%. LD clearly decayed within the genetic distance of 9–10 cM, with r2 ≥ 0.1. Twenty-eight SSR markers were found associated with six fibre quality traits using general linear model and mixed linear model.
  • Publisher: Prague: Czech Academy of Agricultural Sciences (CAAS)
  • Language: English;Czech;Slovak
  • Identifier: ISSN: 1212-1975
    EISSN: 1212-1975
    DOI: 10.17221/142/2016-CJGPB
  • Source: Geneva Foundation Free Medical Journals at publisher websites
    ProQuest Central
    DOAJ Directory of Open Access Journals
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