Phylogenetic tree of genome-sequenced bacterial strains from the Populus microbiome. Phylogenetic tree of genome-sequenced bacterial strains from the Populus microbiome. The tree was inferred from approximately maximum likelihood approach with FastTree v2.1.9. Branch support values are noted on each branch, and branches are colored by phylum or class as follows: yellow, Actinobacteria; red, Bacteroidetes; green, Firmicutes; dark blue, Alphaproteobacteria; blue, Betaproteobacteria; light blue, Gammaproteobacteria. The isolation compartment is noted with color strip as indicated: black, rhizosphere isolate; gray, endosphere isolate. Patricia M. Blair et al. mSystems 2018; doi:10.1128/mSystems.00045-18