Fig. 3

Neighbor Joining tree showing phylogenetic relationships among 31 rhizobial strains. The tree was computed using 103 conserved gene sequences that were concatenated and aligned. There were 114,534 aligned bases in the final dataset after removal of ambiguous positions. Evolutionary distances were computed using the K2P method and are in the units of the number of base substitutions per site. The percentage of replicate trees in which the associated taxa clustered together in the bootstrap test (1000 replicates) is shown next to the branches (red). The tree is drawn to scale, with branch lengths in the same units as those of the evolutionary distances used to infer the phylogenetic tree. Moroccan, Mexican and Indian strains are highlighted in green, purple and blue respectively