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An ultra-high-density genetic map provides insights into genome synteny, recombination landscape and taproot skin colour in radish (Raphanus sativus L.)

文献类型： 外文期刊

作者： Luo, Xiaobo 1 ; Xu, Liang 1 ; Wang, Yan 1 ; Dong, Junhui 1 ; Chen, Yinglong 3 ; Tang, Mingjia 1 ; Fan, Lianxue 1 ; Zhu, Y 1 ;

作者机构： 1.Nanjing Agr Univ, Coll Hort, Natl Key Lab Crop Genet & Germplasm Enhancement, Key Lab Hort Crop Biol & Genet Improvement East C, Nanjing, Peoples R China

2.Guizhou Acad Agr Sci, Guizhou Inst Biotechnol, Guiyang, Peoples R China

3.Univ Western Australia, UWA Inst Agr, Perth, WA, Australia

4.Univ Western Australia, Sch Agr & Environm, Perth, WA, Australia

关键词： radish; single nucleotide polymorphism (SNP); genetic map; recombination; root skin colour

期刊名称：PLANT BIOTECHNOLOGY JOURNAL （ 影响因子：9.803； 五年影响因子：9.555 ）

ISSN： 1467-7644

年卷期： 2020 年 18 卷 1 期

页码：

收录情况： SCI

摘要： High-density genetic map is a valuable tool for exploring novel genomic information, quantitative trait locus (QTL) mapping and gene discovery of economically agronomic traits in plant species. However, high-resolution genetic map applied to tag QTLs associated with important traits and to investigate genomic features underlying recombination landscape in radish (Raphanus sativus) remains largely unexplored. In this study, an ultra-high-density genetic map with 378 738 SNPs covering 1306.8 cM in nine radish linkage groups (LGs) was developed by a whole-genome sequencing-based approach. A total of 18 QTLs for 11 horticulture traits were detected. The map-based cloning data indicated that the R2R3-MYB transcription factor RsMYB90 was a crucial candidate gene determining the taproot skin colour. Comparative genomics analysis among radish, Brassica rapa and B. oleracea genome revealed several genomic rearrangements existed in the radish genome. The highly uneven distribution of recombination was observed across the nine radish chromosomes. Totally, 504 recombination hot regions (RHRs) were enriched near gene promoters and terminators. The recombination rate in RHRs was positively correlated with the density of SNPs and gene, and GC content, respectively. Functional annotation indicated that genes within RHRs were mainly involved in metabolic process and binding. Three QTLs for three traits were found in the RHRs. The results provide novel insights into the radish genome evolution and recombination landscape, and facilitate the development of effective strategies for molecular breeding by targeting and dissecting important traits in radish.

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