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首页> 外文期刊>Plant Pathology >Pathotype diversification in the invasive PstS2 clonal lineage of Puccinia striiformis f. sp. tritici causing yellow rust on durum and bread wheat in Lebanon and Syria in 2010-2011
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Pathotype diversification in the invasive PstS2 clonal lineage of Puccinia striiformis f. sp. tritici causing yellow rust on durum and bread wheat in Lebanon and Syria in 2010-2011

机译：PUCCINIASTRIESIS F的侵入式PSTS2克隆谱系中的途径多样化。 SP。 在2010-2011在黎巴嫩和叙利亚导致黄色生锈的Tritici在黎巴嫩和叙利亚

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摘要

Yellow rust is the major wheat disease in central West Asia and North Africa. Recently, severe epidemics have occurred, with major yield losses in 2010-2011 in Lebanon and Syria. We conducted an extensive field survey, with a collection of 273 samples of Puccinia striiformis f. sp. tritici, to explore the origin of these epidemics. All samples were genotyped with 20 microsatellite markers, and 54 isolates were pathotyped. The population was dominated by the PstS2 lineage, which has spread worldwide since 2000 and displays considerable pathotype diversity (10 pathotypes). The 22 multilocus genotypes (MLGs) detected corresponded to variants of the clonal lineage PstS2, but they differed from the common PstS2 genotype found in the worldwide study conducted between 1981 and 2010. No strong differentiation was observed between Lebanon and Syria. The dominant MLG in Syria was common to both countries. Nine MLGs were found exclusively in the Syrian population and four were restricted to the Lebanese population, including the dominant MLG in Lebanon. The predominant MLG-11 was found in nine pathotypes, at high frequency. The dominant pathotype in Syria was virulent against widely deployed resistance genes (Yr2, Yr6, Yr7, Yr9, Yr25, and Yr27); virulence against Yr3, Yr8, Yr17, and YrSP occurred at various frequencies, but Yr1, Yr4, Yr5, Yr10, Yr15, and Yr32 were effective against all isolates. No host effect was detected. The presence of diverse host populations consisting of landraces and elite varieties, and diverse climatic conditions may account for the unexpectedly high diversity of this clonal population.
机译：黄铁是中西亚和北非的主要小麦疾病。最近，已经发生了严重的流行病，2010-2011在黎巴嫩和叙利亚的主要产量损失。我们进行了一项广泛的田间调查，占普昔氨锡样品的集合综合症。 SP。 Tritici，探索这些流行病的起源。所有样品均采用20种微卫星标记物基因分型，病理均分离有54个分离物。这些人口由PSTS2谱系主导，自2000年以来在全球范围内传播，并显示了相当大的途径多样性（10个病理型）。检测到的22种多体会基因型（MLGS）对应于克隆谱系PSTS2的变体，但它们与1981年至2010年之间的全球研究中发现的常见PSTS2基因型不同。黎巴嫩和叙利亚之间没有观察到强大的分化。叙利亚的占优势MLG对两国都是常见的。在叙利亚人口中专门发现了九个MLG，并且四个被限制在黎巴嫩人口，包括黎巴嫩的主要MLG。优势MLG-11在高频率下含有九个病理型。叙利亚的显性型病理型是毒力的受毒性的抗性基因（YR2，YR6，YR7，YR9，YR25和YR27）;针对YR3，YR8，YR17和YRSP的毒力发生在各种频率下，但YR1，YR4，YR5，YR10，YR15和YR32对所有分离物有效。没有检测到宿主效果。在体育群和精英品种和多样化的气候条件下，可能存在多种宿主人群，可能考虑到这种克隆人群体的意外高多样性。

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