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Appl Environ Microbiol. 1993 April; 59(4): 1018-1024

Ecological and genetic analysis of copper and streptomycin resistance in Pseudomonas syringae pv. syringae.

Department of Plant Pathology, Oklahoma State University, Stillwater 74078.

ABSTRACT

Strains of Pseudomonas syringae pv. syringae resistant to copper, streptomycin, or both compounds were recovered from symptomless and diseased tissue of four woody hosts in three nurseries in Oklahoma. In strains resistant to copper and streptomycin (Cur Smr), resistance to both compounds was cotransferred with a single plasmid which was either 68, 190, or 220 kilobase pairs (kb). All Cus Smr strains contained a 68-kb conjugative plasmid. Cur Sms strains contained one plasmid which varied in size from 60 to 73 kb. All conjugative plasmids which transferred streptomycin resistance contained sequences homologous to the strA and strB Smr genes from the broad-host-range plasmid RSF1010. The Smr determinant was subsequently cloned from a 68-kb Cur Smr plasmid designated pPSR1. A restriction map detailing the organization of the homologous Smr genes from pPSR1 and RSF1010 and cloned Smr genes from P. syringae pv. papulans and Xanthomonas campestris pv. vesicatoria revealed the conservation of all sites studied. The Cur genes cloned from P. syringae pv. tomato PT23 and X. campestris pv. vesicatoria XV10 did not hybridize to the Cur plasmids identified in the present study, indicating that copper resistance in these P. syringae pv. syringae strains may be conferred by a distinct genetic determinant.

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