Fig. 2
Maximum-likelihood cladograms for soil and pond isolates based on partial rpoD sequences. For both habitats, P. aeruginosa PAO1 was used as the outgroup, and published rpoD sequences of 20 members of the P. fluorescens lineage (strain names in bold) were integrated into the cladograms to demonstrate phylogenetic affiliation and diversity of our natural isolates. Yellow triangles and purple circles indicate bootstrap values (50–100%) for branches in the soil (n = 148) and the pond cladogram (n = 149), respectively. Green bars depict pyoverdine production levels of isolates relative to the laboratory reference strains (grey ring). Colour strips around cladograms represent the different communities from which isolates originated. IDs for strains used for pyoverdine cross-feeding and competition assays are enlarged, and the different colours depict pyoverdine non-producers (light blue font), producers with a growth-stimulatory pyoverdine (orange font) and producers with a non-growth-stimulatory pyoverdine (grey font)
