QTL delineation for five fiber quality traits based on an intra-specific Gossypium hirsutum L. recombinant inbred line population

文献类型： 外文期刊

第一作者： Xiaoyun Jia;;Hantao Wang

作者： Xiaoyun Jia;Hantao Wang;Chaoyou Pang;Qifeng Ma;Junji Su;Hengling Wei;Meizhen Song;Shuli Fan;Shuxun Yu

作者机构： State Key Laboratory of Cotton Biology, Institute of Cotton Research of CAAS, Anyang 455000, China;Institute of Cereal and Oil Crops, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang 050051, China;State Key Laboratory of Cotton Biology, Institute of Cotton Research of CAAS, Anyang 455000, China

关键词： Gossypium hirsutum L.; Fiber quality traits; Quantitative trait loci; QTL coincidences; Epistatic QTL

期刊名称：MOLECULAR GENETICS AND GENOMICS （ 2020影响因子：3.291； 五年影响因子：3.257 ）

ISSN： 1617-4615

年卷期： 2018 年 293 卷 4 期

页码：

收录情况： SCI

摘要： Gossypium hirsutum L. is the most important fiber crop worldwide and contributes to more than 95% of global cotton production. Marker-assisted selection (MAS) is an effective approach for improving fiber quality, and quantitative trait loci (QTL) mapping of fiber quality traits is important for cotton breeding. In this study, a permanent intra-specific recombinant inbred line (RIL) population containing 137 families was used for fiber quality testing. Based on a previously reported high-density genetic map with an average marker distance of 0.63 cM, 186 additive QTLs were obtained for five fiber quality traits over five consecutive years, including 39 for fiber length (FL), 36 for fiber strength (FS), 50 for fiber uniformity (FU), 33 for micronaire (MC) and 28 for fiber elongation (FE). Three stable QTLs, qMC-A4-1, qMC-D2-3 and qFS-D9-1, were detected in four datasets, and another eight stable QTLs, qMC-A4-2, qMC-D11-2, qFU-A9-1, qFU-A10-4, qFS-D11-1, qFL-D9-2, qFL-D11-1 and qFE-A3-2, were detected in three datasets. The annotated genes in these 11 stable QTLs were collected, and these genes included many transcription factors with functions during fiber development. 33 QTL coincidence regions were found, and these involved nearly half of the total QTLs. Four chromosome regions containing at least 6 QTLs were promising for fine mapping. In addition, 41 pairs of epistatic QTLs (e-QTLs) were screened, including 6 for FL, 30 for FS, 2 for FU and 3 for MC. The identification of stable QTLs adds valuable information for further QTL fine mapping and gene positional cloning for fiber quality genetic detection and provides useful markers for further molecular breeding in enhancing fiber quality.

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