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首页> 外文期刊>Environmental microbiology >Highly polymorphic markers reveal the establishment of an invasive lineage of the citrus bacterial pathogen Xanthomonas citri pv. citri in its area of origin
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Highly polymorphic markers reveal the establishment of an invasive lineage of the citrus bacterial pathogen Xanthomonas citri pv. citri in its area of origin

机译：高度多态性标记揭示了柑橘细菌病原体柑橘黄单胞菌pv的侵袭谱系的建立。柠檬产地

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摘要

Investigating the population biology of plant pathogens in their native areas is essential to understand the factors that shape their population structure and favour their spread. Monomorphic pathogens dispatch extremely low genetic diversity in invaded areas, and native areas constitute a major reservoir for future emerging strains. One of these, the gammaproteobacterium Xanthomonas citri pv. citri, causes Asiatic canker and is a considerable threat to citrus worldwide. We studied its population genetic structure by genotyping 555 strains from 12 Vietnam provinces at 14 tandem repeat loci and insertion sequences. Discriminant analysis of principal components identified six clusters. Five of them were composed of endemic strains distributed heterogeneously across sampled provinces. A sixth cluster, VN6, displayed a much lower diversity and a clonal expansion structure, suggesting recent epidemic spread. No differences in aggressiveness on citrus or resistance to bactericides were detected between VN6 and other strains. VN6 likely represents a case of bioinvasion following introduction in a native area likely through contaminated plant propagative material. Highly polymorphic markers are useful for revealing migration patterns of recently introduced populations of a monomorphic bacterial plant pathogen.
机译：调查植物病原体在其本地地区的种群生物学对于了解影响其种群结构并促进其传播的因素至关重要。单态病原体在入侵地区的遗传多样性极低，而本地地区则是将来出现的新菌株的主要储存库。其中之一是γ-变形杆菌Xanthomonas citri pv。柠檬引起亚洲溃疡病，对全世界的柑橘构成了巨大威胁。我们通过对来自越南12个省的555株菌株进行14个串联重复基因座和插入序列的基因分型研究，研究了其种群遗传结构。主成分的判别分析确定了六个聚类。其中五个是由在各采样省份间异质分布的地方性菌株组成。第六群，VN6，显示出低得多的多样性和克隆扩展结构，表明最近流行。在VN6和其他菌株之间，没有发现柑橘的侵略性或对杀菌剂的抗性差异。 VN6可能代表了一种可能是通过受污染的植物繁殖材料引入自然区域后发生生物入侵的情况。高度多态性标记可用于揭示单态细菌植物病原体最近引入的种群的迁移模式。

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