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Construction of the first high-density SNP genetic map and identification of QTLs for the natural rubber content in Taraxacum kok-saghyz Rodin

文献类型： 外文期刊

作者： Yang, Yushuang 1 ; Qin, Bi 1 ; Chen, Qiuhui 1 ; Nie, Qiuhai 2 ; Zhang, Jichuan 3 ; Zhang, Liqun 3 ; Liu, Shizhong 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Rubber Res Inst, Haikou 571101, Peoples R China

2.Beijing Linglong Dandel Technol & Dev Ltd, Beijing 101102, Peoples R China

3.Beijing Univ Chem Technol, Coll Mat & Engn, Beijing 100029, Peoples R China

关键词： Taraxacum kok-saghyz Rodin; Natural rubber content; Genetic map; Single nucleotide polymorphism; Quantitative trait locus; Whole-genome resequencing

期刊名称：BMC GENOMICS （ 影响因子：4.4； 五年影响因子：4.7 ）

ISSN： 1471-2164

年卷期： 2023 年 24 卷 1 期

页码：

收录情况： SCI

摘要： Background Taraxacum kok-saghyz Rodin (TKS) is a promising commercial alternative natural rubber (NR) yielding plant. Cultivating TKS with a high NR content is an important breeding target, and developing molecular markers related to NR content can effectively accelerate the breeding process of TKS.Results To construct a high-density SNP genetic map and uncover genomic regions related to the NR content in TKS, an F-1 mapping population of TKS was constructed by crossing two parents (l66 and X51) with significant differences in NR contents. The NR content of the F-1 plants ranged from 0.30 to 15.14% and was distributed normally with a coefficient of variation of 47.61%, indicating quantitative trait inheritance. Then, employing whole-genome resequencing (WGR), a TKS genetic linkage map of 12,680 bin markers comprising 322,439 SNPs was generated. Based on the genetic map and NR content of the F-1 population, six quantitative trait loci (QTLs) for NR content with LOD > 4.0 were identified on LG01/Chr01 and LG06/Chr06. Of them, the 2.17 Mb genomic region between qHRC-C6-1 and qHRCC6-2 on ChrA06, with 65.62% PVE in total, was the major QTL region. In addition, the six QTLs have significant additive genetic effects on NR content and could be used to develop markers for marker-assisted selection (MAS) in TKS with a high NR content.Conclusion This work constructed the first high-density TKS genetic map and identified the QTLs and genomic regions controlling the NR content, which provides useful information for fine mapping, map-based cloning, and MAS in TKS.

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