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Intercepted isolates of Xylella fastidiosa in Europe reveal novel genetic diversity
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Intercepted isolates of Xylella fastidiosa in Europe reveal novel genetic diversity
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Intercepted isolates of Xylella fastidiosa in Europe reveal novel genetic diversity
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Journal Article
Intercepted isolates of Xylella fastidiosa in Europe reveal novel genetic diversity
2016
Overview
After the first confirmed outbreak of
Xylella fastidiosa
in the European Union (EU), associated with an olive disease denoted olive quick decline syndrome, mandatory surveys are now carried out in the member States and inspections increased at EU entry points such as ports. Such activities led to the interception of
X. fastidiosa
-infected coffee plants in consignments originating from Central America. Similarly, the geographic expansion of the olive decline epidemic area of the Apulia region (southern Italy) prompted investigations to identify new host plants. Here we report the interception of three novel bacterial sequence types in Italy, based on multi-locus sequence typing, that cluster with different
X. fastidiosa
subspecies, illustrating the risk of the introduction of additional pathogen genetic diversity into Europe. In the epidemic area of Apulia, new foci as well as host plant species positive with
X. fastidiosa
, including cherry, myrtleleaf and rosemary, were found to be all infected with the same sequence type of this bacterium (ST53, or CoDiRO strain). This work highlights the limited knowledge of
X. fastidiosa
phylogenetic and phenotypic diversity, the risk of novel
X. fastidiosa
introductions via contaminated plant material, and corroborates other studies indicating that the Apulia epidemic emerged from a single introduction of this pathogen into the region.
