Phenotypic variability in different strains of Pseudomonas syringae subsp. savastanoi isolated from different hosts.
A total of 160 strains of P. syringae subsp. savastanoi [P. savastanoi pv. savastanoi] from Olea europaea, Olea europaea var. sylvestris, Nerium oleander, Fraxinus angustifolia and Retama sphaerocarpa, and 4 type strains of other pathovars were investigated for 102 phenotypic traits. These included biochemical characteristics, assimilation of different C sources, sensitivity or resistance to antibiotics and IAA production. Results were analysed with an affinity dendrogram via the Jaccard coefficient. Data suggested an influence of environmental factors on the formation of the 15 phenons obtained, since isolated (Knot) strains from the same species but different geographical areas were segregated. Segregation, also detected in strains from different hosts within the same area, added to the pathogenicity test helps to characterise these strains as different pathovars.