Puccinia striiformis f.sp tritici presents high diversity and recombination in the over-summering zone of Gansu, China

文献类型： 外文期刊

第一作者： Enjalbert, J.

作者： Enjalbert, J.;Duan, X.;Tellier, A.;Wan, A.;Leconte, M.;de Vallavielle-Pope, C.

作者机构：

关键词： effective size;linkage disequilibrium;parasexuality;survival;wheat (stripe) yellow rust

期刊名称：MYCOLOGIA （ 影响因子：2.696； 五年影响因子：3.089 ）

ISSN： 0027-5514

年卷期： 2010 年 102 卷 1 期

页码：

收录情况： SCI

摘要： Puccinia striiformis f.sp. tritici (PST), a basidiomycota responsible for wheat yellow rust, has a strict Clonal behavior and a low genetic diversity in European and Australian populations. On the other hand high diversity has been reported in Chinese populations. Moreover it is thought that in China yellow rust. epidemics start recurrently from the western highlands where over-summering Occurs. To compare PST genetic diversity in this area to the one described in France seven AFLP primer combinations were used to analyze a sample of 160 isolates collected in 2001 in five counties of Gansu Province. The AFLP data revealed 40 polymorphic bands, discriminating 139 AFLP genotypes. Linkage disequilibrium and phylogeographic analyses Support the hypothesis of a reproductive mode that is not strictly clonal. In this regard Chinese isolates front Gansu strongly contrast with the European Studies using the same markers. Genetic diversity of this 1 y sampling in Gansu is found to be seven times higher than the one observed in France over 20 y and exhibits lower linkage disequilibrium. The effective Population size of the French sample was estimated to be 1000 times smaller than the Gansu Population. These results support the hypothesis of large population size as well as the occurrence of genetic recombination, while the importance of Gansu as a main over-summering area requires assessment through larger scale studies.

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