The LAB were grown overnight and the genomic DNA was extracted from 1.5 ml cultures using a bacterial genome extraction kit (Tiangen, China) following the manufacturer's protocols. The identification of isolates was analyzed based on the 16S rDNA gene amplification with primer pair: 16S rDNA-F (5′-AGA GTT TGA TCC ATG GCT CAG-3′)/16S rDNA-R (5′-AAG GAG GTG ATC CAG CC-3′). Then PCR was performed using a previously described method (24 (link)). The sequences for the amplified 16S rDNA were searched using Blast in the NCBI databases to compare with the registered sequences.
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