Association mapping analysis of fiber yield and quality traits in Upland cotton (Gossypium hirsutum L.)

文献类型： 外文期刊

第一作者： Mulugeta Seyoum Ademe

作者： Mulugeta Seyoum Ademe;Du, Xiongming;Jia, Yinhua;Shoupu He;Zhaoe Pan;Junling Sun;Qinglian Wang;Hongde Qin;Jinhai Liu;Hui Liu;Jun Yang;Dongyong Xu;Jinlong Yang;Zhiying Ma;Jinbiao Zhang;Zhikun Li;Zhongmin Cai;Xuelin Zhang;Xin Zhang;Aifen Huang;Xianda Yi;Guanyin Zhou;Lin Li;Haiyong Zhu;Baoyin Pang;Liru Wang;Yinhua Jia;Xiongming Du

作者机构：

关键词： Upland cotton;SSRs;Linkage disequilibrium;Association mapping;Fiber quality;QTLs

期刊名称：MOLECULAR GENETICS AND GENOMICS （ 影响因子：3.291； 五年影响因子：3.257 ）

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收录情况： SCI

摘要： Fiber yield and quality are the most important traits for Upland cotton (Gossypium hirsutum L.). Identifying high yield and good fiber quality genes are the prime concern of researchers in cotton breeding. Association mapping offers an alternative and powerful method for detecting those complex agronomic traits. In this study, 198 simple sequence repeats (SSRs) were used to screen markers associated with fiber yield and quality traits with 302 elite Upland cotton accessions that were evaluated in 12 locations representing the Yellow River and Yangtze River cotton growing regions of China. Three subpopulations were found after the estimation of population structure. The pair-wise kinship values varied from 0 to 0.867. Only 1.59% of the total marker locus pairs showed significant linkage disequilibrium (LD, p < 0.001). The genome-wide LD decayed within the genetic distance of similar to 30 to 32 cM at r (2) = 0.1, and decreased to similar to 1 to 2 cM at r (2) = 0.2, indicating the potential for association mapping. Analysis based on a mixed linear model detected 57 significant (p < 0.01) marker-trait associations, including seven associations for fiber length, ten for fiber micronaire, nine for fiber strength, eight for fiber elongation, five for fiber uniformity index, five for fiber uniformity ratio, six for boll weight and seven for lint percent, for a total of 35 SSR markers, of which 11 markers were associated with more than one trait. Among marker-trait associations, 24 associations coincided with the previously reported quantitative trait loci (QTLs), the remainder were newly identified QTLs/genes. The QTLs identified in this study will potentially facilitate improvement of fiber yield and quality in the future cotton molecular breeding programs.

分类号： Q7

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