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首页> 外文期刊>Environmental microbiology >The Pseudomonas viridiflava phylogroups in the P. syringae species complex are characterized by genetic variability and phenotypic plasticity of pathogenicity-related traits
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The Pseudomonas viridiflava phylogroups in the P. syringae species complex are characterized by genetic variability and phenotypic plasticity of pathogenicity-related traits

机译：丁香假单胞菌种复合体中的绿假单胞菌系统群的特征在于与致病性相关的性状的遗传变异和表型可塑性

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摘要

As a species complex, Pseudomonas syringae exists in both agriculture and natural aquatic habitats. P. viridiflava, a member of this complex, has been reported to be phenotypically largely homogenous. We characterized strains from different habitats, selected based on their genetic similarity to previously described P. viridiflava strains. We revealed two distinct phylogroups and two different kinds of variability in phenotypic traits and genomic content. The strains exhibited phase variation in phenotypes including pathogenicity and soft rot on potato. We showed that the presence of two configurations of the Type III Secretion System [single (S-PAI) and tripartite (T-PAI) pathogenicity islands] are not correlated with pathogenicity or with the capacity to induce soft rot in contrast to previous reports. The presence/absence of the avrE effector gene was the only trait we found to be correlated with pathogenicity of P. viridiflava. Other Type III secretion effector genes were not correlated with pathogenicity. A genomic region resembling an exchangeable effector locus (EEL) was found in S-PAI strains, and a probable recombination between the two PAIs is described. The ensemble of the variability observed in these phylogroups of P. syringae likely contributes to their adaptability to alternating opportunities for pathogenicity or saprophytic survival.
机译：作为一种物种复合物，丁香假单胞菌存在于农业和自然水生生境中。据报道，P。viridiflava是这种复合物的成员，在表型上基本上是同质的。我们表征了来自不同栖息地的菌株，这些菌株是根据与先前描述的P. viridiflava菌株的遗传相似性选择的。我们揭示了两个不同的类群和表型性状和基因组含量的两种不同的变异性。该菌株在包括致病性和马铃薯软腐病的表型上表现出相变。我们显示，与先前的报道相比，III型分泌系统[单个（S-PAI）和三方（T-PAI）致病岛]的两种配置的存在与致病性或诱导软腐的能力无关。 avrE效应子基因的存在与否是我们发现与P. viridiflava的致病性相关的唯一特征。其他III型分泌效应基因与致病性无关。在S-PAI菌株中发现了类似于可交换效应基因座（EEL）的基因组区域，并描述了两种PAI之间的可能重组。在丁香假单胞菌的这些系统群中观察到的变异性的整体可能有助于它们适应致病性或腐生性生存的交替机会。

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