2.8. Phylogenetic analysis
Genomic DNA was extracted using phenolechloroform
extraction method. The PCR parameters for the amplification
of 16S ribosomal DNA were optimized. 50 ml of PCR master mix
contained universal primer set 27 F- (50-AG AGT TTG ATC MTG
GCT CAG-30)/1492 R- (50-G GYT ACC TTG TTA CGA CTT-30),
10mMdNTPS, 10 PCR Buffer, 1 U Taq DNA polymerase, 2mM
Mgþ and (100e200 ng) template DNA. PCR steps included
initial denaturation at 95 C for 5 min, 35 cycles of denaturation
at 95 C for 1 min, annealing at 56 C for 2 min, elongation
at 72 C for 1 min and final extension at 72 C for 10 min.
Approximately 1.5 kb amplicons were generated. The PCR
product was purified using Gene JET PCR purification kit
(Fermentas) using manufacturer’s instructions. Purified PCR
products were sequenced and sequence search similarities
were conducted using BLAST.4,15 Phylogenetic analysis of
sequence data of bacteria under study was aligned with
reference sequence homology from the NCBI database using
the multiple sequence alignment of MEGA 5.0 Program