Phenotypic characterization of 763 strains representing the genetic diversity in the P. syringae complex.

Values are the percent of P. syringae strains giving positive reactions for the different phenotypes. Arginine dihydrolase production was negative for all strains.aPG = P. syringae phylogroup.bINA = ice nucleation activity of at least 106 cells at >−8°C.cProduction of a broad host range toxin was evaluated with the test habitually used to reveal syringomycin-like toxins based on the capacity to produce an inhibition zone of growth of Geotricum candidum.dStrains were considered to be pathogenic on the cantaloupe indicator plant if at least half (6/12) of the seedlings showed compatible reactions.eAvirulent strains did not induce any disease reaction on cantaloupe seedlings.fFrequency of strains for which the mean disease severity on cantaloupe seedlings was ≥2.0.Phenotypic characterization of 763 strains representing the genetic diversity in the P. syringae complex.