数字农科院2.0

Construction of a high-density SNP genetic map in fluecured tobacco based on SLAF-seq

文献类型： 外文期刊

作者： Gong, Daping;Xu, Xiuhong;Wang, Chuanyi;Ren, Min;Wang, Chunkai;Chen, Mingli;Huang, Long;Xu, Xiuhong;Wang, Chunkai;Wang, Chunkai

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关键词： Single nucleotide polymorphism;Genetic map;Quantitative trait locus;SLAF-seq;Tobacco

期刊名称： MOLECULAR BREEDING

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收录情况： SCI

摘要： Tobacco (Nicotiana tabacum L., 2n = 48) is an important agronomic crop and model plant. Fluecured tobacco is the most important type and accounts for approximately 80 % of tobacco production worldwide. The low genetic diversity of flue-cured tobacco impedes the construction of a high-density genetic linkage map using simple sequence repeat (SSR) markers and warrants the exploitation of single nucleotide polymorphic (SNP) markers from genomic regions. In this article, initially using specific locus-amplified fragment sequencing, we discovered 10,891 SNPs that were subsequently used as molecular markers for genetic map construction. Combined with SSR markers, a final high-density genetic map was generated containing 4215 SNPs and 194 SSRs distributed on 24 linkage groups (LGs). The genetic map was 2662.43 cM in length, with an average distance of 0.60 cM between adjacent markers. Furthermore, by mapping the SNP markers to the ancestral genomes of Nicotiana tomentosiformis and Nicotiana sylvestris, a large number of genome rearrangements were identified as occurring after the polyploidization event. Finally, using this novel integrated map and mapping population, two major quantitative trait loci (QTLs) were identified for flue-curing and mapped to the LG6 of tobacco. This is the first report of SNP markers and a SNP-based linkage map being developed in tobacco. The high-density genetic map and QTLs related to tobacco curing will support gene/QTL fine mapping, genome sequence assembly and molecular breeding in tobacco.

分类号： Q94

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