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Thirty-three fluorescent Pseudomonas strains isolated from tomato pith necrosis (FPTPN strains) and 89 Pseudomonas corrugata strains were studied by numerical taxonomy. In the dendrogram of distances, the P. corrugata strains constituted a single phenon (phenon 1), whereas 17 of the 33 FPTPN strains clustered in a separate phenon (phenon 2). The other 16 FPTPN strains were included in phena consisting of well-characterized fluorescent Pseudomonas species or were isolated phenotypes. Phena 1 and 2 were distinguished by fluorescence on King B medium, accumulation of poly-beta-hydroxybutyrate, production of levan, and assimilation of sorbitol. DNA-DNA hybridization showed that P. corrugata is a true genomic species (66 to 100% DNA relatedness) and that the FPTPN strains of phenon 2 were divided into three genomic groups. Genomic groups 1 and 2 were not distinct from each other phenotypically, and genomic group 3 could be distinguished from genomic groups 1 and 2 only on the basis of assimilation of citraconate and laevulinate. Genomic groups 1 and 2 are related to P. corrugata (40 to 55% DNA relatedness), whereas genomic group 3 is less closely related to P. corrugata (20 to 23% DNA relatedness). The lipopolysaccharide patterns on electrophoresis gels and fatty acid profiles of strains belonging to genomic group 1 through 3 are different from each other and from the lipopolysaccharide patterns and fatty acid profiles of P. corrugata. However, cross-reactions were observed between P. corrugata and the FPTPN strain genomic groups, indicating that there are common epitopes of the lipopolysaccharides. The three FPTPN strain genomic groups were not named as species but were designated Pseudomonas genomospecies FP1, FP2, and FP3.

international journal of systematic bacteriology

Taxonomy of Pseudomonas Strains Isolated from Tomato Pith Necrosis: Emended Description of Pseudomonas corrugata and Proposal of Three Unnamed Fluorescent Pseudomonas Genomospecies