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Evolution of copper resistance in the kiwifruit pathogen Pseudomonas syringae pv. actinidiae through acquisition of integrative conjugative elements and plasmids

Elena Colombi, Christina Straub, Sven Künzel, Matthew D. Templeton, Honour C. McCann, Paul B. Rainey
doi: https://doi.org/10.1101/070391
Elena Colombi
1New Zealand Institute for Advanced Study, Massey University, Auckland, New Zealand.
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Christina Straub
1New Zealand Institute for Advanced Study, Massey University, Auckland, New Zealand.
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Sven Künzel
2Max Planck Institute for Evolutionary Biology, Plön, Germany.
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Matthew D. Templeton
3Plant and Food Research, Auckland, New Zealand.
4School of Biological Sciences, University of Auckland, Auckland, New Zealand.
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Honour C. McCann
1New Zealand Institute for Advanced Study, Massey University, Auckland, New Zealand.
5South China Botanical Institute, Chinese Academy of Sciences, Guangzhou, China.
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Paul B. Rainey
1New Zealand Institute for Advanced Study, Massey University, Auckland, New Zealand.
2Max Planck Institute for Evolutionary Biology, Plön, Germany.
6Ecole Supérieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris-Tech), PSL Research University, Paris, France.
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Abstract

SUMMARY Lateral gene transfer can precipitate rapid evolutionary change. In 2010 the global pandemic of kiwifruit canker disease caused by Pseudomonas syringae pv. actinidiae (Psa) reached New Zealand. At the time of introduction, the single clone responsible for the outbreak was sensitive to copper, however, analysis of a sample of isolates taken in 2015 and 2016 showed that a quarter were copper resistant. Genome sequences of seven strains showed that copper resistance – comprising czc/cusABC and copABCD systems – along with resistance to arsenic and cadmium, was acquired via uptake of integrative conjugative elements (ICEs), but also plasmids. Comparative analysis showed ICEs to have a mosaic structure, with one being a tripartite arrangement of two different ICEs and a plasmid that were isolated in 1921 (USA), 1968 (NZ) and 1988 (Japan), from P. syringae pathogens of millet, wheat and kiwifruit, respectively. Two of the Psa ICEs were nearly identical to two ICEs isolated from kiwifruit leaf colonists prior to the introduction of Psa into NZ. Additionally, we show ICE transfer in vitro and in planta, analyze fitness consequences of ICE carriage, capture the de novo formation of novel recombinant ICEs, and explore ICE host-range.

ORIGINALITY-SIGNIFICANT STATEMENT Lateral gene transfer is a major evolutionary force, but its immediacy is often overlooked. Between 2008 and 2010 a single virulent clone of the kiwifruit pathogen Pseudomonas syringae pv. actinidiae spread to kiwifruit growing regions of the world. After arrival in New Zealand it acquired genetic determinants of copper resistance in the form of integrative conjugative elements and plasmids. Components of these elements are evident in distantly related bacteria from millet (USA, 1921), kiwifruit (Japan, 1988) and wheat (New Zealand, 1968). Additional laboratory experiments capture evidence of the dynamism underpinning the evolution of these elements in real time and further emphasize the potent role that lateral gene transfer plays in microbial evolution.

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Posted August 19, 2016.
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Evolution of copper resistance in the kiwifruit pathogen Pseudomonas syringae pv. actinidiae through acquisition of integrative conjugative elements and plasmids
Elena Colombi, Christina Straub, Sven Künzel, Matthew D. Templeton, Honour C. McCann, Paul B. Rainey
bioRxiv 070391; doi: https://doi.org/10.1101/070391
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Evolution of copper resistance in the kiwifruit pathogen Pseudomonas syringae pv. actinidiae through acquisition of integrative conjugative elements and plasmids
Elena Colombi, Christina Straub, Sven Künzel, Matthew D. Templeton, Honour C. McCann, Paul B. Rainey
bioRxiv 070391; doi: https://doi.org/10.1101/070391

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