Evidence of genetic recombination in wheat yellow rust populations of a Chinese oversummering area

文献类型： 外文期刊

第一作者： Mboup, M.

作者： Mboup, M.;Leconte, M.;Gautier, A.;de Vallavieille-Pope, C.;Enjalbert, J.;Wan, A. M.;Chen, W.;Wan, A. M.

作者机构：

关键词： Recombination;Stripe rust;Genetic structure;Altitude;Virulence;Spores;Amplified fragment length polymorphism;Gene flow;Parasexual cycle;Genotypes;Genetic diversity;Triticum aestivum;Puccinia striiformis

期刊名称：FUNGAL GENETICS AND BIOLOGY （ 影响因子：3.495； 五年影响因子：3.831 ）

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收录情况： SCI

摘要： Wheat yellow rust (Puccinia striiformis f.sp. tritici) (PST) has been described as a strongly clonal species in both European and Australian populations, with very limited molecular diversity but rapidly evolving virulences. Contrastingly, marked genetic diversity has been reported in Chinese PST populations. To test whether such variability could originate from oversummering areas, we assessed the diversity of virulence and molecular markers (AFLP and SSR) using 412 PST isolates from the highlands of Tianshui county in Gansu province. Very marked phenotypic and genotypic diversity (38% and 89%, respectively) was found. No genetic structure dependent on the sites sampled (Fst = 0.004) or altitude distribution (Fst = 0.0098) was detected, indicating important gene flow at the county scale. This study also revealed genetic recombination between molecular markers and thus strongly suggests the existence of a sexual or parasexual cycle in PST in Tianshui county. The observations of higher rates of sexual spore production in genotypes originating from Tianshui are the very first elements suggestive of the existence of a sexual cycle in this species. Crown Copyright

分类号： Q939.5

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