Genetic diversity and linkage disequilibrium studies on a 3.1-Mb genomic region of chromosome 3B in European and Asian bread wheat (Triticum aestivum L.) populations

文献类型： 外文期刊

第一作者： Hao, C. Y.

作者： Hao, C. Y.;Perretant, M. R.;Choulet, F.;Wang, L. F.;Paux, E.;Sourdille, P.;Feuillet, C.;Balfourier, Francois;Hao, C. Y.;Wang, L. F.;Zhang, X. Y.;Hao, C. Y.;Wang, L. F.;Zhang, X. Y.;Hao, C. Y.;Wang, L. F.;Zhang, X. Y.

作者机构：

关键词： simple sequence repeat linkage disequilibrium;genetic differentiation;genetic diversity;molecular diversity;population structure;gene density;disease resistance;whole genome;genetic;genepool

期刊名称：THEORETICAL AND APPLIED GENETICS （ 影响因子：5.699； 五年影响因子：5.565 ）

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年卷期：

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收录情况： SCI

摘要： Genetic diversity and linkage disequilibrium (LD) were investigated in 376 Asian and European accessions of bread wheat (Triticum aestivum L.). After a first and rapid screening about diversity and genetic structure at the whole genome scale using 70 simple sequence repeats (SSRs), we focused on a sequenced contig (ctg954) of 3.1 Mb located on the short arm of chromosome 3B of cv. Chinese Spring, using 32 SSRs and 10 single nucleotide polymorphisms. This contig is part of a multiple fungal resistance region. Mean polymorphism information content value on the 32 SSRs was slightly higher in the Asian genepool (0.396) than that for the European (0.329) pool. Compared with results at the whole genome scale, data from this 3.1-Mb region indicated similar trends in genetic diversity indices between both genepools. Population structure and molecular variance analyses demonstrated significant genetic differentiation and geographical subdivision in both groups of accessions. Concerning LD at the contig level, the European population had a significantly higher mean r (2) value (0.23) than the Asian population (0.18), indicating a stronger LD in the European material. With a mean of 1 marker every 74 kb, the resolution reached here allowed to perform a detailed comparative analysis of the LD and genetic diversity along the complete 3.1-Mb region in both genepools. A sliding-window approach revealed some interesting regions of the contig where LD is increasing when genetic diversity is decreasing. This study provides an in-depth understanding of molecular population genetics in European and Asian wheat gene pools, and prospects for association mapping of important sources of fungal disease resistance.

分类号： R394

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