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首页> 外文期刊>Plant Pathology >Clonality and long-distance migration of Puccinia striiformis f.sp. tritici in north -west Europe
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Clonality and long-distance migration of Puccinia striiformis f.sp. tritici in north -west Europe

机译：小麦条锈菌的克隆性和远距离迁移西北欧的小麦

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摘要

The biotrophic fungus Puccinia striiformis f.sp tritici , a basidiomycete that causes yellow rust on wheat, is spread by wind-dispersed spores. Analysis of amplified fragment length polymorphism (AFLP) variation showed that the fungus frequently migrates between the UK, Germany, France and Denmark . There is no biological evidence for sexual or parasexual reproduction under natural conditions , and this was supported by the lack of recombination , as revealed by AFLP ove the time an area repreaented by the samples in this study. A phylogeographic analysis revealed that there was effectively a single, clonal population in the four countries, up to 1700 km apart, consistent with a 'continent -island' model in which Denmark is the recipient of migrants from other cuountriesl In five cases, specific pathogen clones were dispersed between the UK and Denmark, and on at least two recent occasions clones were also spread from the UK to Germany countries. The agronomic consequences of migration were enhanced because of the limted genetic diversity for yellow rust resistance in whea cultivars in the area. These results demonstrate that long-distance migration of pathogen clones, coupled with low diversity in the host species, may cause previously useful resistance genes to become ineffective for disease control on a continental scale.
机译：一种具有生物营养能力的真菌Puccinia striiformis f.sp tritici，一种在小麦上引起黄锈的担子菌，通过风散布的孢子传播。扩增片段长度多态性（AFLP）变异的分析表明，真菌经常在英国，德国，法国和丹麦之间迁移。在自然条件下，没有生物学证据证明有性或副性生殖，这是由于缺乏重组支持的，AFLP揭示了该研究中样本所占的时间。地理学分析表明，四个国家中实际上只有一个克隆种群，相距不超过1700公里，这与“大陆-岛屿”模式相一致，在该模式中，丹麦是来自其他国家的移民的接收者。在五种情况下，特定的病原体克隆散布在英国和丹麦之间，最近至少有两次克隆也从英国传播到德国国家。迁移的农艺后果得到增强，因为该地区的小麦品种的抗黄锈性遗传多样性有限。这些结果表明，病原体克隆的远距离迁移，加上宿主物种的多样性低，可能导致以前有用的抗性基因在大陆范围内对疾病控制无效。

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