QTL mapping and genetic effect of chromosome segment substitution lines with excellent fiber quality from Gossypium hirsutum x Gossypium barbadense

文献类型： 外文期刊

第一作者： Li, Shao-qi

作者： Li, Shao-qi;Liu, Ai-ying;Kong, Ling-lei;Gong, Ju-wu;Li, Jun-wen;Gong, Wan-kui;Ge, Qun;Shang, Hai-hong;Xiao, Xiang-hui;Liu, Rui-xian;Zhang, Qi;Shi, Yu-zhen;Yuan, You-lu;Lu, Quan-wei;Li, Peng-tao

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关键词： CSSLs; Chromosome introgressed segments; Fiber quality; QTL; Genetic effects

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

ISSN： 1617-4615

年卷期： 2019 年 294 卷 5 期

页码：

收录情况： SCI

摘要： Chromosome segment substitution lines (CSSLs) are ideal materials for identifying genetic effects. In this study, CSSL MBI7561 with excellent fiber quality that was selected from BC4F3:5 of CCRI45 (Gossypium hirsutum) x Hai1 (Gossypium barbadense) was used to construct 3 secondary segregating populations with 2 generations (BC5F2 and BC5F2:3). Eighty-one polymorphic markers related to 33 chromosome introgressive segments on 18 chromosomes were finally screened using 2292 SSR markers which covered the whole tetraploid cotton genome. A total of 129 quantitative trait loci (QTL) associated with fiber quality (103) and yield-related traits (26) were detected on 17 chromosomes, explaining 0.85-30.35% of the phenotypic variation; 39 were stable (30.2%), 53 were common (41.1%), 76 were new (58.9%), and 86 had favorable effects on the related traits. More QTL were distributed in the Dt subgenome than in the At subgenome. Twenty-five stable QTL clusters (with stable or common QTL) were detected on 22 chromosome introgressed segments. Finally, the 6 important chromosome introgressed segments (Seg-A02-1, Seg-A06-1, Seg-A07-2, Seg-A07-3, Seg-D07-3, and Seg-D06-2) were identified as candidate chromosome regions for fiber quality, which should be given more attention in future QTL fine mapping, gene cloning, and marker-assisted selection (MAS) breeding.

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