食品科学 ›› 2012, Vol. 33 ›› Issue (5): 170-176.doi: 10.7506/spkx1002-6630-201205037

• 生物工程 • 上一篇    下一篇

川西高原牦牛酸奶子乳酸菌遗传多样性及系统发育研究

田鸿,蒲彪,张小平   

  1. 1.四川农业大学资源环境学院 2.四川农业大学食品学院
  • 出版日期:2012-03-15 发布日期:2012-03-03
  • 基金资助:
    四川省科技厅科技支撑计划项目(2010NZ0045)

Genetic Diversity and Phylogeny of Lactic Acid Bacterial Strains Isolated from Yak Yoghurt in Western Sichuan Platea

TIAN Hong,PU Biao,ZHANG Xiao-ping   

  1. 1. College of Resource and Enviroment, Sichuan Agricultural University, Chengdu 611134, China; 2. College of Food Science, Sichuan Agricultural University, Ya,an 625014, China
  • Online:2012-03-15 Published:2012-03-03

摘要: 采用16S rDNA基因的限制性酶切片段长度多态性分析(16S rDNA-PCR-RFLP)和16S~23S rDNA基因间区(ISR)的酶切多态性分析(ISR-PCR-RFLP)技术,研究分离自川西高原牦牛酸奶子的81株乳酸菌的遗传多样性,并结合16S rDNA序列分析技术研究16S rDNA-PCR-RFLP的各类群代表菌株的系统发育关系。结果表明:供试菌株共有23种16S rDNA遗传型,供试菌株按61%相似系数可分为4个类群,按81%相似系数,可分为16个类群,结合序列分析结果,乳杆菌属(Lactobacillus)、肠球菌属(Enterococcus)细菌为主要类群;16S~23S rDNA基因的ISR扩增产物的酶切分析表明,供试菌株共有19种ISR遗传型,按60%相似系数,供试菌株可分为4个类群,按80%相似系数,供试菌株可划分为14个类群。

关键词: 牦牛酸奶子, 乳酸菌, 相似水平, 系统发育

Abstract: The genetic diversity and the phylogeny of 81 lactic acid bacterial strains isolated from yak yogurt samples collected from Western Sichuan Plateau were studied by using 16S rDNA-PCR-RFLP, ISR-PCR-RFLP techniques, and 16S rDNA gene sequence analysis. The results showed totally 23 16S rDNA genotypes were detected and the tested strains could be divided into four taxa on the basis of 61% similarity, and 16 taxa on the basis of 81% similarity. Sequence analysis of 16S rDNA genes showed that genus Lactobacillus and genus Enterococcus were two major genera in all tested strains. ISR-PCR-RFLP analysis also revealed 19 ISR genotypes, and the tested strains could be divided into four taxa on the basis of 60% similarity, and 14 taxa on the basis of 80% similarity.

Key words: yak yoghurt, lactic acid bacteria, similarity level, phylogeny

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