DNA Relatedness among the Pathovar Strains of Pseudomonas syringae subsp. savastanoi Janse (1982) and Proposal of Pseudomonas savastanoi sp. nov.

We found that Pseudomonas syringae subsp. savastanoi strains belong to a DNA relatedness group that includes strains of P. syringae pv. glycinea and P. syringae pv. phaseolicola. This DNA group was distinct from P. syringae pv. syringae (including the type strain of P. syringae). The results of a numerical analysis were in accord with DNA hybridization data. Thus, P. syringae subsp. savastanoi (Janse) 1982 is elevated to species level as Pseudomonas savastanoi sp. nov., which includes P. savastanoi pv. savastanoi, P. savastanoi pv. glycinea, and P. savastanoi pv. phaseolicola.