Genetic diversity and evolutionary relationship analyses within and among Raphanus species using EST-SSR markers
文献类型： 外文期刊
作者： Wang, Qingbiao 1 ; Zhang, Li 1 ; Zheng, Pengjing 1 ;
作者机构： 1.Beijing Acad Agr & Forestry Sci, Beijing Vegetable Res Ctr, Beijing 100097, Peoples R China
2.Minist Agr, Key Lab Biol & Genet Improvement Zof Hort Crops N, Beijing 100097, Peoples R China
关键词： Raphanus;Radish;Genetic diversity;Evolutionary relationships;EST-SSR
期刊名称：MOLECULAR BREEDING （ 影响因子：2.589； 五年影响因子：2.75 ）
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收录情况： SCI
摘要： We screened 626 pairs of EST-SSR primers from the radish marker database using 37 different cultivars. Of the primer pairs, 89.3 % (559) were polymorphic. The average polymorphism information content (PIC) value per primer was 0.39, ranging from 0.07 to 0.73. Fifty EST-SSR markers were designated core markers according to PCR band reproducibility and stability, high polymorphism levels, easily discriminated alleles, and an even distribution of molecular markers over each radish chromosome. Genetic diversity and the evolutionary relationships of 93 radish accessions, representing nearly all typical Raphanus germplasms, were assessed with 50 core EST-SSR markers. A total of 254 alleles at 52 loci (4.88 alleles per locus on average), with a mean PIC value of 0.55, were detected. The wild radish had the largest range of variation, followed by the East Asian big long radish and the European small radish. Unweighted pair group method with arithmetic mean cluster analysis classified the 93 germplasms into four groups. The first group included most accessions belonging to R. sativus, while seven wild Raphanus strains were separated into the remaining groups. In the R. sativus group, the subspecies var. hortensis Becker, var. raphanistroides Makino, var. caudatus Hooker and Anderson, var. sativus L., var. niger Kerner, and var. oleiferus Metzg were sorted into separate subgroups. Population genetics structure analyses show that the accessions were attributed to three populations: (1) Asia cultivated and East Asian wild, (2) Europe cultivated, and (3) wild Raphanus species. Herein, we discuss the origin and ancestry of cultivated radishes based on these results.
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