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Volume 69, Issue 1

Genomic analyses of pv. actinidiae isolated in Korea suggest the transfer of the bacterial pathogen via kiwifruit pollen Free

Abstract

The bacterial pathogen, pv. actinidiae (Psa), has emerged as a major threat to kiwifruit cultivation throughout the world. One pandemic strain (from the Psa3 group) has occurred in various geographical regions. It is important to understand how this pathogen is being transmitted.

Although Psa has been found in Korea since 1992, the isolates were until recently of a distinct type (Psa2). Recently, the more virulent Psa3 type has been detected. The purpose of this study was to describe the variety of Psa3 now found in Korea.

Strains were isolated from kiwifruit plants in Korea and from pollen imported into Korea from New Zealand. The genomes of 10 isolates were sequenced using the Illumina platform and compared to the completely assembled genomes of pandemic Psa3 strains from New Zealand and China. Comparisons were also made with pandemic strains from Chile and non-pandemic Psa3 isolates from China.

Six of the 10 Psa3 isolates from Korea show a clear relationship with New Zealand isolates. Two isolates show a distinct relationship to isolates from Chile; one further isolate has a sequence that is highly similar to that of M228, a strain previously isolated in China; and the last isolate belongs to the Psa3 group, but is not a member of the pandemic lineage.

This analysis establishes that there have been multiple routes of transmission of the Psa3 pandemic strain into Korea. One route has involved the importation of pollen from New Zealand. A second route probably involves importation from Chile.

  • Received:
  • Accepted:
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Keyword(s): bacterial canker , genome sequencing , kiwifruit , pollen and Pseudomonas syringae pv. actinidiae
© 2020 The Authors
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2020-01-01
2024-04-26
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Genomic analyses of Pseudomonas syringae pv. actinidiae isolated in Korea suggest the transfer of the bacterial pathogen via kiwifruit pollen
J. Med. Microbiol. 69, 132 (2020); https://doi.org/10.1099/jmm.0.001115
/content/journal/jmm/10.1099/jmm.0.001115
/content/journal/jmm/10.1099/jmm.0.001115
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