Fig. 1

Pangenomic and phylogenetic features of Pseudomonas aeruginosa. a Presence/absence matrix of P. aeruginosa genes across the strains. Core and accessory genomes are marked. b The frequency distribution of the genes among the 1488 strains. The right end of the distribution, marked with red *, corresponds to the core genome, while the left end of the distribution corresponds to singletons and rare accessory genes. c Phylogenetic tree of P. aeruginosa strains. Phylogenetically related MLST groups are shown in different colors. Isolation source is shown on top of the tree. An apparent clade enriched for environmental strains (indicated by *) is artificially enlarged by the repeated presence of a set of almost identical genomes in the set used to build the phylogeny. The phylogenetic locations of the 52 isolates experimentally tested in this study are indicated in the outer circle (black bars)