Association analysis of fibre traits in Gossypium arboreum accessions |
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| Authors: | S K Kantartzi and J McD Stewart |
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| Institution: | Crop, Soil and Environmental Sciences, University of Arkansas, Fayetteville 72701, AR, USA, E-mail: |
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| Abstract: | Advances in the use of diploid Asiatic species in cotton breeding require an understanding of the relatedness and ancestry of diploid cotton accessions, and identification of simple sequence repeat (SSR) markers associated with agronomically important phenotypic traits, for example, fibre quality. Fifty‐six Gossypium arboreum germplasm accessions introduced from nine regions of Africa, Asia and Europe were evaluated for eight fibre characters (lint percentage, lint colour, elongation, micronaire, strength, 50% span length, 2.5% span length and maturity%) and genotyped with 98 SSR markers. When viewed across all accessions most of the SSR markers were polymorphic. Population structure analysis identified six main clusters for the accessions which corresponded to different geographic regions, indicating agreement between genetic and predefined populations. The general linear model method was used to disclose marker–trait associations. Marker–trait associations were investigated by fitting single marker regression models for phenotypic traits on marker band intensities with correction for population structure. This paper illustrates the potential of association mapping in diploid cotton, because existing phenotypic data, a modest number of SSR markers, and a pioneering statistical analysis, identified interesting associations. |
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| Keywords: | Gossypium arboreum linkage disequilibrium population structure relatedness diploid cotton |
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