Determination of nucleotide sequence of 16S rDNA
Genomic DNA was extracted by Genome DNA Simax Kit (Beijing SBS Genetech Co., Ltd., China). The PCR amplification was carried out in a DNA thermo cycler TP 600 (TaKaRa
Bio Inc., Otsu, Shiga, Japan) with universal primers: 16F27 (5’AGA GTT TGA TCC TGG CTC AG-3’) and 16R1522 (5’-AAG GAG GTG ATC CAG CCG CA-3’). The method was used
according to the manufacturer’s instructions. The PCR conditions consisted of 35 cycles of 94°C for 1 min, 55°C for 1 min and 72°C for 2 min. Nucleotide sequencing was commercially
serviced by Macrogen Inc. co. Ltd. (Seoul, Korea). The obtained 16S rDNA sequence was compared with those in the database and the phylogenic tree was made using Neighbor
Joining tree, PHYLIP Version 3.5 (see http://evolution.genetics.washington.edu/phylip.html, accessed July 23, 2009)