Phylogenetic tree showing relationships between this study’s Bradyrhizobium strains and those isolated by similar local/international research. Maximum Likelihood phylogenetic tree showing the relationships between nodC sequences of Bradyrhizobium strains for this study (SW OTU strains) as well as those sequences previously isolated from acacia soils (JLR OTU strains), acacia nodules (South Africa: JHK OTU strains; Australia: HU_MG accessions) and CCR legumes (‘BL’ accessions) as indicated by the shaded blocks in the corresponding table. Tree is drawn to scale with branch length measured in the number of substitutions per site. Nodal support is given as bootstrap values.