Document Detail

Genetic diversity, population structure and linkage disequilibrium in elite Chinese winter wheat investigated with SSR markers.
MedLine Citation:
PMID:  22957076     Owner:  NLM     Status:  MEDLINE    
To ascertain genetic diversity, population structure and linkage disequilibrium (LD) among a representative collection of Chinese winter wheat cultivars and lines, 90 winter wheat accessions were analyzed with 269 SSR markers distributed throughout the wheat genome. A total of 1,358 alleles were detected, with 2 to 10 alleles per locus and a mean genetic richness of 5.05. The average genetic diversity index was 0.60, with values ranging from 0.05 to 0.86. Of the three genomes of wheat, ANOVA revealed that the B genome had the highest genetic diversity (0.63) and the D genome the lowest (0.56); significant differences were observed between these two genomes (P<0.01). The 90 Chinese winter wheat accessions could be divided into three subgroups based on STRUCTURE, UPGMA cluster and principal coordinate analyses. The population structure derived from STRUCTURE clustering was positively correlated to some extent with geographic eco-type. LD analysis revealed that there was a shorter LD decay distance in Chinese winter wheat compared with other wheat germplasm collections. The maximum LD decay distance, estimated by curvilinear regression, was 17.4 cM (r(2)>0.1), with a whole genome LD decay distance of approximately 2.2 cM (r(2)>0.1, P<0.001). Evidence from genetic diversity analyses suggest that wheat germplasm from other countries should be introduced into Chinese winter wheat and distant hybridization should be adopted to create new wheat germplasm with increased genetic diversity. The results of this study should provide valuable information for future association mapping using this Chinese winter wheat collection.
Xiaojie Chen; Donghong Min; Tauqeer Ahmad Yasir; Yin-Gang Hu
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-09-05
Journal Detail:
Title:  PloS one     Volume:  7     ISSN:  1932-6203     ISO Abbreviation:  PLoS ONE     Publication Date:  2012  
Date Detail:
Created Date:  2012-09-07     Completed Date:  2013-02-14     Revised Date:  2013-07-11    
Medline Journal Info:
Nlm Unique ID:  101285081     Medline TA:  PLoS One     Country:  United States    
Other Details:
Languages:  eng     Pagination:  e44510     Citation Subset:  IM    
State Key Laboratory of Crop Stress Biology in Arid Areas, College of Agronomy, Northwest Agricultural and Forestry University, Yangling, Shaanxi, China.
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MeSH Terms
Chromosome Mapping / methods
Cluster Analysis
DNA / genetics
Genes, Plant
Genetic Markers*
Genetic Variation*
Genome, Plant
Linkage Disequilibrium*
Microsatellite Repeats
Models, Statistical
Nucleic Acid Hybridization
Regression Analysis
Triticum / genetics*
Reg. No./Substance:
0/Genetic Markers; 9007-49-2/DNA

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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