Genetic diversity a population structure analysis of a accessions in the Chinese cowpea [Vigna unguiculata (L.) Walp.] germplasm collection

文献类型： 外文期刊

第一作者： Chen, Honglin

作者： Chen, Honglin;Hu, Liangliang;Wang, Lixia;Wang, Suhua;Cheng, Xuzhen;Chen, Hong;Wang, Ming Li

作者机构：

关键词： Vigna unguiculata (L.) Walp;Cultivated cowpea collection;Microsatellite marker;Genetic diversity;Population structure

期刊名称：CROP JOURNAL （ 影响因子：4.407； 五年影响因子：5.687 ）

ISSN： 2095-5421

年卷期： 2017 年 5 卷 5 期

页码：

收录情况： SCI

摘要： Cowpea (Vigna unguiculata) is an important legume crop with diverse uses. The species is presently a minor crop, and evaluation of its genetic diversity has been very limited. In this study, a total of 200 genic and 100 genomic simple sequence repeat (SSR) markers were developed from cowpea unigene and genome sequences, respectively. Among them, 27 genic and 27 genomic SSR markers were polymorphic and were used for assessment of genetic diversity and population structure in 105 selected cowpea accessions. A total of 155 alleles and 2.9 alleles per marker were identified, and the average polymorphic information content (PIC) value was 0.3615. The average PIC of genomic SSRs (0.3996) was higher than that of genic SSRs (0.3235), and most of the polymorphic genomic SSRs were composed of di- and trinucleotide repeats (51.9% and 37.0% of all loci, respectively). The low level of detected genetic diversity may be attributed to a severe genetic bottleneck that occurred during the cowpea domestication process. The accessions were classified by structure and cluster analysis into four subgroups that correlated well with their geographic origins or collection sites. The classification results were also consistent with the results from principal coordinate analysis and can be used as a guide during future germplasm collection and selection of accessions as breeding materials for cultivar improvement. The newly developed genic and genomic SSR markers described in this study will be valuable genomic resources for the assessment of genetic diversity, population structure, evaluation of germplasm accessions, construction of genetic maps, identification of genes of interest, and application of marker-assisted selection in cowpea breeding programs. (C) 2017 Crop Science of China and Institute of Crop Science, CAAS. Production and hosting by Elsevier B.V.

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