Figure 1: Flagellar systems of B. diazoefficiens.

(a) Transmission electron micrograph of a planktonic cell that was grown in liquid AG medium, with its subpolar flagellum (arrow) and at least five lateral flagella, some of which are partially bundled (arrowhead). The contrast was enhanced to better appreciate flagellar filaments. Scale bar: 0.25 μm. (b) Neighbour-joining phylogeny based on concatenated sequences of FlhA, FlhB, FliF, FliG and FliP of main Bradyrhizobium species showing the primary (I) and secondary (II) flagellar systems. Bootstrap values higher than 70 are indicated at the nodes. Scale bar, 0.01 amino acid substitutions per site.