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QTLs conferring FOV 7 resistance detected by linkage and association mapping in Upland cotton

文献类型： 外文期刊

作者： Mei, Hongxian 2 ; Ai, Nijiang 3 ; Zhang, Xin 4 ; Ning, Zhiyuan 1 ; Zhang, Tianzhen 1 ;

作者机构： 1.Nanjing Agr Univ, MOE Hybrid Cotton R&D Engn Res Ctr, Natl Key Lab Crop Genet & Germplasm Enhancement, Nanjing 210095, Jiangsu, Peoples R China

2.Henan Acad Agr Sci, Sesame Res Ctr, Zhengzhou 450008, Peoples R China

3.Xinjiang Shihezi Cotton Res Inst, Shihezi 832000, Peoples R China

4.Jiangsu Acad Agr Sci, Inst Plant Protect, Nanjing 210014, Jiangsu, Peoples R China

关键词： Fusarium oxysporum f. sp. Vasinfectum race 7 (FOV 7);Host resistance;Upland cotton;Linkage mapping;Association mapping

期刊名称：EUPHYTICA （ 影响因子：1.895； 五年影响因子：2.181 ）

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收录情况： SCI

摘要： Fusarium wilt is a worldwide disease that affects cotton production. Molecular markers tightly linked to resistance genes can be used for marker-assisted and/or genomic selection. We performed both family-based linkage mapping and population-based association mapping (AM) to detect quantitative trait loci (QTLs) conferring resistance against Fusarium oxysporum f. sp. vasinfectum race 7 (FOV 7) in Upland cotton. To identify QTLs underlying FOV 7 resistance by linkage mapping, three Upland cotton cultivars/lines, Xuzhou 142, Yumian 21 and Shang 9901, were used to obtain the composite cross population, designated as Xuzhou 142/Yumian 21//Xuzhou 142/Shang 9901. A linkage map containing 185 simple sequence repeat loci and 40 linkage groups was constructed with an average distance of 7.5 cM between adjacent markers. Seven QTLs were detected by linkage mapping, explaining 2.9-6.6 % of the total phenotypic variance. We also performed marker-trait AM with the MLM model (Q + K) in a panel composed of 356 Upland cotton cultivars. In total, 27 loci were significantly associated with FOV 7 resistance at the alpha = 0.01 level (-log(10) P a parts per thousand yen 2), which were distributed on 16 chromosomes and explained 1.48-12.99 % of phenotypic variation. Three of the 7 QTLs identified by linkage mapping could be detected in AM. We identified the favorable allele for each of the 27 associated loci and investigated the number of favorable alleles in each accession. The results should increase our understanding of the genetic basis of FOV resistance and facilitate future resistance breeding in Upland cotton.

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