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- W2549936235 abstract "ABSTRACT Recurring epidemics of kiwifruit ( Actinidia spp.) bleeding canker disease are caused by Pseudomonas syringae pv. actinidiae ( Psa ), whose emergence coincided with domestication of its host. The most recent pandemic has had a deleterious effect on kiwifruit production worldwide. In order to strengthen understanding of population structure, phylogeography and evolutionary dynamics of Psa , we sampled 746 Pseudomonas isolates from cultivated and wild kiwifruit across six provinces in China, of which 87 were Psa . Of 234 Pseudomonas isolated from wild Actinidia spp. none were identified as Psa . Genome sequencing of fifty isolates and the inclusion of an additional thirty from previous studies show that China is the origin of the recently emerged pandemic lineage. However China harbours only a fraction of global Psa diversity, with greatest diversity found in Korea and Japan. Distinct transmission events were responsible for introduction of the pandemic lineage of Psa into New Zealand, Chile and Europe. Two independent transmission events occurred between China and Korea, and two Japanese isolates from 2014 cluster with New Zealand Psa . Despite high similarity at the level of the core genome and negligible impact of within-lineage recombination, there has been substantial gene gain and loss even within the single clade from which the global pandemic arose. SIGNIFICANCE STATEMENT Bleeding canker disease of kiwifruit caused by Pseudomonas syringae pv. actinidiae ( Psa ) has come to prominence in the last three decades. Emergence has coincided with domestication of the host plant and provides a rare opportunity to understand ecological and genetic factors affecting the evolutionary origins of Psa . Here, based on genomic analysis of an extensive set of strains sampled from China and augmented by isolates from a global sample, we show, contrary to earlier predictions, that China is not the native home of the pathogen, but is nonetheless the source of the recent global pandemic. Our data identify specific transmission events, substantial genetic diversity and point to non-agricultural plants in either Japan or Korea as home to the source population." @default.
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- W2549936235 date "2016-11-05" @default.
- W2549936235 modified "2023-09-25" @default.
- W2549936235 title "Origin and Evolution of a Pandemic Lineage of the Kiwifruit Pathogen Pseudomonas syringae pv. actinidiae" @default.
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- W2549936235 doi "https://doi.org/10.1101/085613" @default.
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