Abstract
Bacterial diversity of Tibetan kefir grains from different areas in China was investigated by culture-independent metagenomic methods, and comprehensive taxonomic profiling was done. Eleven genera and their proportions were found in all the 4 samples, and they were Lactococcus (40.93–72.02 %), Lactobacillus (10.50–47.89 %), Acetobacter (4.50–14.15 %), Shewanella (1.73–7.58 %), Leuconostoc (0.64–0.84 %), Pseudomonas (0.07–0.63 %), Streptococcus (0.02–0.22 %), Acinetobacter (0.05–0.12 %), Pelomonas (0–0.01 %), Dysgonomonas (0–0.01 %), and Weissella (0–0.01 %). Shewanella, Acinetobacter, Pelomonas, Dysgonomonas, Weissella, and Pseudomonas were the first time found in Tibetan kefir grains. α-Diversity analysis showed that they varied in bacterial richness and diversity while β-diversity showed that the variation of genera composition among sampling sites was small. Principal component analysis showed that Lactobacillus, Lactococcus, and Acetobacter were the main genera which caused the diversity. This study provided theoretical basis for further investigation and application of Tibetan kefir grains.
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