16S rDNA sequencing
The 16S rDNA sequences were edited using the Staden software, and the BLAST algorithm (http://blast.ncbi.nlm.nih.gov) was used to compare the sequences with other sequences previously deposited in the GenBank database. The sequences were aligned to those of type strains using the MEGA 5.2 software. Following the alignment, a dendrogram was constructed using the neighbor-joining method with 1000 bootstrap replicates, the Tamura three-parameter model, and the Gamma (G) distribution (Fig. 1) in the same software.