FIGURE 2.

Phylogenetic tree highlighting the relative positions of P. polymyxa ZF129 and ZF197 among other P. polymyxa strains and Bacillus species. The phylogenetic tree was constructed based on six housekeeping genes (16S rRNA, gapA, gyrA, atpD, rpoA, and rho) according to the aligned gene sequences using maximum likelihoods derived from MEGA 6.0 software. Bootstrap values (1,000 replicates) are shown at the branch points. The scale bar indicates 0.05 nucleotide substitutions per nucleotide position. The GenBank accession numbers associated with the housekeeping loci of all strains can be found in Supplementary Table S2.