High-density linkage map construction and QTL analysis for earliness-related traits in Gossypium hirsutum L
文献类型： 外文期刊
作者： Jia, Xiaoyun 1 ; Pang, Chaoyou 1 ; Wei, Hengling 1 ; Wang, Hantao 1 ; Ma, Qifeng 1 ; Yang, Jilong 1 ; Cheng, Shuaishuai 1 ; Su, Junji 1 ; Fan, Shuli 1 ; Song, Meizhen 1 ; Wusiman, Nusireti 1 ; Yu, Shuxun 1 ;
作者机构： 1.College of Agronomy, Northwest A&F University, Yangling 712100, China;State Key Laboratory of Cotton Biology, Institute of Cotton Research of CAAS, Anyang 455000, China
2.State Key Laboratory of Cotton Biology, Institute of Cotton Research of CAAS, Anyang 455000, China
3.Institute of Industrial Crops of Xinjiang Academy of Agricultural Sciences, Xinjiang 830091, Ch
关键词： Gossypium hirsutum L;Cotton earliness;Single nucleotide polymorphism (SNP);High-density genetic map;Quantitative trait loci (QTLs)
期刊名称：BMC GENOMICS （ 影响因子：3.969； 五年影响因子：4.478 ）
ISSN： 1471-2164
年卷期： 2016 年 17 卷
页码：
收录情况： SCI
摘要： Background: Gossypium hirsutum L., or upland cotton, is an important renewable resource for textile fiber. To enhance understanding of the genetic basis of cotton earliness, we constructed an intra-specific recombinant inbred line population (RIL) containing 137 lines, and performed linkage map construction and quantitative trait locus (QTL) mapping. Results: Using restriction-site associated DNA sequencing, a genetic map composed of 6,434 loci, including 6,295 single nucleotide polymorphisms and 139 simple sequence repeat loci, was developed from RIL population. This map spanned 4,071.98 cM, with an average distance of 0.63 cM between adjacent markers. A total of 247 QTLs for six earliness-related traits were detected in 6 consecutive years. In addition, 55 QTL coincidence regions representing more than 60 % of total QTLs were found on 22 chromosomes, which indicated that several earliness-related traits might be simultaneously improved. Fine-mapping of a 2-Mb region on chromosome D3 associated with five stable QTLs between Marker25958 and Marker25963 revealed that lines containing alleles derived from CCRI36 in this region exhibited smaller phenotypes and earlier maturity. One candidate gene (EMF2) was predicted and validated by quantitative real-time PCR in early, medium-and late-maturing cultivars from 3- to 6-leaf stages, with highest expression level in early-maturing cultivar, CCRI74, lowest expression level in late-maturing cultivar, Bomian1. Conclusions: We developed an SNP-based genetic map, and this map is the first high-density genetic map for short-season cotton and has the potential to provide deeper insights into earliness. Cotton earliness-related QTLs and QTL coincidence regions will provide useful materials for QTL fine mapping, gene positional cloning and MAS. And the gene, EMF2, is promising for further study.
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