2.3. Amplification and sequencing of 16S rRNA gene
Amplification of the 16S rDNA (1500 bp) was conducted using
specific primers for the Acetobacter genus, as follows: F: 50-
AGAGTTTGATCMTGGCTCAG-30 and R: 50-TACCTTGTTAGGACTTCACC-
30. The polymerase chain reaction (PCR) program cycles were
as follows: denaturation at 95 C for 4 min, 32 cycles of 94 C for
1 min, 58 C for 1 min, and 72 C for 95 s, and final extension conducted
for 5 min at 72 C. The PCR products were electrophoresed,
and the 16S rRNA-amplified DNA band was purified using the QIAquick
PCR purification kit (QIAGEN, Hilden, Germany) based on the
instructions on the kit. The purified DNAs were sequenced by
Macrogen, a Korean company. The sequencing results were blasted
with the deposited sequences in the National Center for Biotechnology
Information (NCBI) and GenBank site (http://blast.ncbi.nlm.
nih.gov/Blast.cgi) to identify the isolated bacteria cells.