FIG. 3.

Phylogenetic tree based on partial nifH product amino acid sequences, including the sequences of P. azotofixans strains and Paenibacillus spp. and other sequences from the database. The location of the nifH fragments used for the analysis corresponds to Anabaena (Nostoc) sp. strain 7120 residues 48 to 155 (GenBank accession no. A00534). The database accession numbers are indicated after the bacterial names. Bootstrap values (percentages) for parsimony (above the lines) and neighbor joining (below the lines) are shown for clusters supported by both analyses; only values greater than 50% are shown.