Figure 5.

Phylogenetic tree of napA (A), dsrB (B) and mcrA (C) protein sequences detected in the injected and produced water samples obtained from Luliang reservoir. Distance-based evolutionary trees were constructed by the neighboring-joining method with 1000 bootstrap replicates. The scale bar represents 0.05 inferred substitutions per nucleotide position. Percentages of bootstrap support are indicated at the branch points. The nucleotide sequence accession numbers and clones of each OTU were presented in brackets. OTU, operational taxonomic units.