Figure 3. Phylogenetic analysis of the soxB gene clones.

The final dataset of 186 nucleotide sequences include sequences from low saline (SS1), high saline (SS2), agricultural (AS) soil clone libraries coded as ‘SA’, ‘SB’ ‘SC’ respectively, and closely related soxB gene sequences from known cultured representatives and environmental clones. 500 bootstrap analyses were performed and percentages are shown at nodes. The scale bar indicates 0.2 substitutions per site. The apsA gene sequence of Sulfurimonas denitrificans was used as outgroup for tree calculations.