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Construction of a high-density DArTseq SNP-based genetic map and identification of genomic regions with segregation distortion in a genetic population derived from a cross between feral and cultivated-type watermelon

文献类型： 外文期刊

作者： Ren, Runsheng 1 ; Ray, Rumiana 2 ; Li, Pingfang 1 ; Xu, Jinhua 1 ; Zhang, Man 1 ; Liu, Guang 1 ; Yao, Xiefeng 1 ; Kilian, 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Vegetable Crops, Nanjing 210014, Jiangsu, Peoples R China

2.Univ Nottingham, Sch Biosci, Div Plant & Crop Sci, Loughborough LE12 5RD, Leics, England

3.DArT PL, Canberra, ACT 2600, Australia

关键词： Watermelon;Linkage map;SNP;High density;DArTseq

期刊名称：MOLECULAR GENETICS AND GENOMICS （ 2020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： Watermelon [Citrullus lanatus (Thunb.) Matsum. & Nakai] is an economically important vegetable crop grown extensively worldwide. To facilitate the identification of agronomically important traits and provide new information for genetic and genomic research on this species, a high-density genetic linkage map of watermelon was constructed using an F-2 population derived from a cross between elite watermelon cultivar K3 and wild watermelon germplasm PI 189225. Based on a sliding window approach, a total of 1,161 bin markers representing 3,465 SNP markers were mapped onto 11 linkage groups corresponding to the chromosome pair number of watermelon. The total length of the genetic map is 1,099.2 cM, with an average distance between bins of 1.0 cM. The number of markers in each chromosome varies from 62 in chromosome 07 to 160 in chromosome 05. The length of individual chromosomes ranged between 61.8 cM for chromosome 07 and 140.2 cM for chromosome 05. A total of 616 SNP bin markers showed significant (P < 0.05) segregation distortion across all 11 chromosomes, and 513 (83.3 %) of these distorted loci showed distortion in favor of the elite watermelon cultivar K3 allele and 103 were skewed toward PI 189225. The number of SNPs and InDels per Mb varied considerably across the segregation distorted regions (SDRs) on each chromosome, and a mixture of dense and sparse SNPs and InDel SDRs coexisted on some chromosomes suggesting that SDRs were randomly distributed throughout the genome. Recombination rates varied greatly among each chromosome, from 2.0 to 4.2 centimorgans per megabase (cM/Mb). An inconsistency was found between the genetic and physical positions on the map for a segment on chromosome 11. The high-density genetic map described in the present study will facilitate fine mapping of quantitative trait loci, the identification of candidate genes, map-based cloning, as well as marker-assisted selection (MAS) in watermelon breeding programs.

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