Development of Cymbidium ensifolium genic-SSR markers and their utility in genetic diversity and population structure analysis in cymbidiums
文献类型: 外文期刊
作者: Li, Xiaobai 1 ; Jin, Feng 2 ; Jin, Liang 1 ; Jackson, Aaron 3 ; Huang, Cheng 4 ; Li, Kehu 5 ; Shu, Xiaoli 6 ;
作者机构: 1.Zhejiang Acad Agr Sci, Hangzhou 310021, Zhejiang, Peoples R China
2.Hubei Univ, Coll Life Sci, Wuhan 430062, Peoples R China
3.ARS, USDA, Dale Bumpers Natl Rice Res Ctr, Stuttgart, AR 72160 USA
4.Shaoxing Cty Agr Bur, Agr Technol Extens Stn, Shaoxing 312000, Peoples R China
5.Univ Hong Kong, Sch Biol Sci, Hong Kong, Hong Kong, Peoples R China
6.Zhejiang Univ, State Key Lab Rice Biol, Int Atom Energy Agcy Collaborating Ctr, Hangzhou 310029, Peoples R China
关键词: Cymbidium ensifolium;Genic-SSR;Genetic diversity;Population structure
期刊名称:BMC GENETICS ( 影响因子:2.797; 五年影响因子:3.263 )
ISSN: 1471-2156
年卷期: 2014 年 15 卷
页码:
收录情况: SCI
摘要: Background: Cymbidium is a genus of 68 species in the orchid family, with extremely high ornamental value. Marker-assisted selection has proven to be an effective strategy in accelerating plant breeding for many plant species. Analysis of cymbidiums genetic background by molecular markers can be of great value in assisting parental selection and breeding strategy design, however, in plants such as cymbidiums limited genomic resources exist. In order to obtain efficient markers, we deep sequenced the C. ensifolium transcriptome to identify simple sequence repeats derived from gene regions (genic-SSR). Result: The 7,936 genic-SSR markers were identified. A total of 80 genic-SSRs were selected, and primers were designed according to their flanking sequences. Of the 80 genic-SSR primer sets, 62 were amplified in C. ensifolium successfully, and 55 showed polymorphism when cross-tested among 9 Cymbidium species comprising 59 accessions. Unigenes containing the 62 genic-SSRs were searched against Non-redundant (Nr), Gene Ontology database (GO), eukaryotic orthologous groups (KOGs) and Kyoto Encyclopedia of Genes and Genomes (KEGG) database. The search resulted in 53 matching Nr sequences, of which 39 had GO terms, 18 were assigned to KOGs, and 15 were annotated with KEGG. Genetic diversity and population structure were analyzed based on 55 polymorphic genic-SSR data among 59 accessions. The genetic distance averaged 0.3911, ranging from 0.016 to 0.618. The polymorphic index content (PIC) of 55 polymorphic markers averaged 0.407, ranging from 0.033 to 0.863. A model-based clustering analysis revealed that five genetic groups existed in the collection. Accessions from the same species were typically grouped together; however, C. goeringii accessions did not always form a separate cluster, suggesting that C. goeringii accessions were polyphyletic. Conclusion: The genic-SSR identified in this study constitute a set of markers that can be applied across multiple Cymbidium species and used for the evaluation of genetic relationships as well as qualitative and quantitative trait mapping studies. Genic-SSRs coupled with the functional annotations provided by the unigenes will aid in mapping candidate genes of specific function.
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