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. 1994 Aug;60(8):2924–2930. doi: 10.1128/aem.60.8.2924-2930.1994

Identification and relatedness of coronatine-producing Pseudomonas syringae pathovars by PCR analysis and sequence determination of the amplification products.

S Bereswill 1, P Bugert 1, B Völksch 1, M Ullrich 1, C L Bender 1, K Geider 1
PMCID: PMC201744  PMID: 7916181

Abstract

Production of the chlorosis-inducing phytotoxin coronatine in the Pseudomonas syringae pathovars atropurpurea, glycinea, maculicola, morsprunorum, and tomato has been previously reported. DNA hybridization studies previously indicated that the coronatine biosynthetic gene cluster is highly conserved among P. syringae strains which produce the toxin. In the present study, two 17-bp oligonucleotide primers derived from the coronatine biosynthetic gene cluster of P. syringae pv. glycinea PG4180 were investigated for their ability to detect coronatine-producing P. syringae strains by PCR analysis. The primer set amplified diagnostic 0.65-kb PCR products from genomic DNAs of five different coronatine-producing pathovars of P. syringae. The 0.65-kb products were not detected when PCR experiments utilized nucleic acids of nonproducers of coronatine or those of bacteria not previously investigated for coronatine production. When the 0.65-kb PCR products were digested with ClaI, PstI, and SmaI, fragments of identical size were obtained for the five different pathovars of P. syringae. A restriction fragment length polymorphism was detected in the amplified region of P. syringae pv. atropurpurea, since this pathovar lacked a conserved PvuI site which was detected in the PCR products of the other four pathovars. The 0.65-kb PCR products from six strains comprising five different pathovars of P. syringae were cloned and sequenced. The PCR products from two different P. syringae pv. glycinea strains contained identical DNA sequences, and these showed relatedness to the sequence obtained for the pathovar morsprunorum. The PCR products obtained from the pathovars maculicola and tomato were the most similar to each other, which supports the hypothesis that these two pathovars are closely related.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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