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Appl. Environ. Microbiol., Oct 1995, 3530-3536, Vol 61, No. 10
Copyright © 1995, American Society for Microbiology

Molecular and Physiological Characterization of Pseudomonas syringae pv. tomato and Pseudomonas syringae pv. maculicola Strains That Produce the Phytotoxin Coronatine

DA Cuppels and T Ainsworth
Agriculture and Agri-Food Canada, Pest Management Research Centre, London, Ontario, Canada

The chlorosis-inducing phytotoxin coronatine is produced by several Pseudomonas syringae pathovars, including glycinea, morsprunorum, atropurpurea, and the closely related tomato and maculicola. To date, all coronatine-producing pv. glycinea, morsprunorum, and atropurpurea strains that have been examined carry the gene cluster that controls toxin production on a large plasmid. In the present study the genomic location of the coronatine gene cluster was determined for coronatine-producing strains of the pv. tomato-maculicola group by subjecting their genomic DNA to pulsed-field electrophoresis and Southern blot analysis with a hybridization probe from the coronatine gene cluster. The cluster was chromosomally borne in 10 of the 22 strains screened. These 10 strains infected both crucifers and tomatoes but could not use sorbitol as a sole source of carbon. The remaining 12 coronatine-producing strains had plasmid-borne toxin gene clusters and used sorbitol as a carbon source. Only one of these strains was pathogenic on both crucifers and tomatoes; the remainder infected just tomatoes. Restriction fragment length polymorphism analysis of the pv. tomato-maculicola coronatine gene clusters was performed with probes from P. syringae pv. tomato DC3000, a tomato and crucifer pathogen. Although the coronatine cluster appeared, in general, to be highly conserved across the pv. tomato-maculicola group, there were significant differences between plasmid-borne and chromosomally borne genes. The extensively studied coronatine cluster of pv. glycinea 4180 closely resembled the plasmid-borne clusters of the pv. tomato-maculicola group.


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