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Fig. S1 Neighbor-joining tree constructed on the basis of sequences of the housekeeping gene fragment cts for 70 environmental Pto relatives and 23 clonal P. syringae crop pathogens.

Fig. S2 (a) Neighbor-joining tree based on the concatenated set of the nine gene fragments also used to build the phylogenetic tree shown in Fig. 2; (b) Bayesian consensus trees based on the individual nine gene fragments treating gene fragments as partitions with their own evolutionary models.

Fig. S3 Disease symptoms caused by environmental strains on Arabidopsis thaliana ecotype ‘Columbia’, cauliflower, celery and snapdragon, compared with a crop pathogen of each plant species and the Pto strain K40.

nph12316-sup-0002-TableS1.pdfapplication/PDF74KTable S1 Details of all samples from which the original 238 P. syringae strains used in this study were isolated

Table S2 Shimodaira–Hasegawa (SH) test (Shimodaira & Hasegawa, 1999) results

Table S3 Estimates of population recombination rate (ρ) and population mutation rate (θ) for all loci

Table S4 Molecular evolutionary models of each gene for all strains