Fig. 2.

Phylogenetic tree based on MLST for 44 isolates of Venezuelan soybean-nodulating rhizobia and 22 reference strains representing six genera. The tree is based on 2,900-bp DNA fragments. Numbers at the nodes indicate the level of bootstrap support (%), based on a neighbor-joining analysis of 1,000 re-sampled datasets. The scale bar represents substitutions per nucleotide position with 0.02 changes per site. The isolate name included the elevation (MASL) and respective climatic zone of the sampling site.