2.3. PCR amplification of 16S rDNA from strain A21
Genomic DNA was prepared with a TIANamp Bacteria DNA Kit (Tiangen, Beijing, China). The primer sequences for the amplification and sequencing of the 16S rDNA genes were: 27F (50-AGAGTTTGATCCTGGCTCAG-30) and 1525R (50-AAAGGAGGTGATCCAGCC-30) (Devereux and Willis, 1995), which amplified a fragment of approximately 1458 bp. Fragments obtained were purified and sequenced.