2.5.2. Polymerase chain reaction
Total cellular DNA was isolated and oligonucleotide primers (PLB16,
5′-AGAGTTTGATCCTGGCTCAG-3′; and MLB16, 5′-GGCTGCTGGCACGT
AGTTAG-3′) were used to amplify the variable (V1) region of the 16S
ribosomal RNA gene, as described previously (Hébert et al., 2000).
Polymerase chain reaction amplicons were sequenced at the CERELACONICET
(Tucumán, Argentina) using an ABI 3130Hitachi Genetic
Analyzer (Applied Biosystems–Life Technologies, Buenos Aires,
Argentina), and highly similar sequences were searched using the
Basic Local Alignment Search Tool (BLAST) of the National Center
for Biotechnology Information