2.3.1. Molecular identification
The extraction of genomic DNA from isolate QH, as well as PCR amplification and sequencing of its 16S rRNA gene, was performed according to Cao et al. (2014). The nearly complete 16S rRNA gene sequence was assembled using MegAlign, Editseq and Seqman software. A search was performed in the National Centre for Biotechnology Information (NCBI) database for sequence homology using the Basic Local Alignment Search Tool (BLAST) program. A phylogenetic tree from the nearly complete 16S rRNA gene sequence of the isolate and its homologous sequences was constructed
using the neighbor-joining method.