Figure 2

The maximum likelihood phylogenetic relationships of root nodule rhizobial isolates isolated from Polhillia pallens (red), Wiborgia obcordata (blue), Wiborgia sericea (black) and Wiborgiella sessilifolia (green), based on Mesorhizobium-16S rRNA sequence analysis. Test isolates are shown in bold. The significance of each branch is indicated by a bootstrap value = > 50 for each node (1000 replicates). The scale bar represents the number of changes per nucleotide position.