Phylogenetic tree of 3,837 high quality and non-redundant bacterial genomes. Outer ring denotes the taxonomic group, central ring denotes the isolation
source, and inner ring denotes the root-associated genomes within plant-associated genomes. Taxon names are
color-coded based on phylum: green – Proteobacteria, red – Firmicutes, blue –
Bacteroidetes, purple – Actinobacteria. (Asaf Levy)