Fig. 4.

Phylogenetic tree estimated using the ML method with partial sequences of the symbiotic protein encoding nifH gene using the phyml program. The alignment length was 474 nucleotides from positions 313 to 786 of the nifH gene with respect to the nifH gene encoded on the pSymA of Sinorhizobium meliloti 1021. Only bootstrap values ≥50% are shown. Type strains are indicated by superscript T. The Acaciella angustissima strains are shown in bold. The accession numbers for the sequences are indicated within parentheses. Those generated in this work are shown in bold. Host and geographical origin are in parentheses.