FOOD SCIENCE ›› 2013, Vol. 34 ›› Issue (7): 206-211.doi: 10.7506/spkx1002-6630-201307043

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Randomly Amplified Polymorphic DNA (RAPD) Analysis of Lactic Acid Bacteria from Yak Milk Cheese

YANG Ji-xia1,CHEN Zhi-lan2,YANG Hai-yan3,HUANG Ai-xiang4,CHEN Zong-dao1   

  1. 1. College of Food Science, Southwest University, Chongqing 400715, China; 2. Center of Biology, Tibet Agricultural and Animal Husbandry College, Linzhi 860000, China; 3. College of Food Science and Pharmacy, Xinjiang Agricultural University, ürümqi 830052, China; 4. College of Food Science and Technology, Yunnan Agricultural University, Kunming 650201, China
  • Received:2012-07-15 Revised:2013-03-12 Online:2013-04-15 Published:2013-03-20
  • Contact: Ji-Xia YANG E-mail:yangjx@swu.edu.cn

Abstract: Objective: To explore the application value of randomly amplified polymorphic DNA (RAPD)-PCR for the genotype evaluation of lactic acid bacteria isolated from yak milk cheeses. Methods: In order to establish a reliable RAPD protocol with primer M13, factors such as annealing temperature, Mg2+ concentration, primer amount, Taq polymerase and DNA template for affecting the quality and reproducibility of RAPD profiles were investigated. The optimal PCR procedure and reaction reagent concentration were employed for RAPD amplification of 39 isolates from yak milk cheese on the basis of previous identification of 16S rRNA sequence analysis. The electrophoretic profiles were analyzed using NTsys2.10e software, genetic similarity coefficients were calculated and a cluster dendrogram was plotted. Results: Genetic similarity coefficients of 39 strains ranged from 0.47 to 0.98. The cluster dendrogram showed that 39 isolates were classified into 10 groups using the similarity coefficient of 0.78 as a cut-off point. The discrimination of groups was consistent with the assignment of the species based on 16S rRNA sequence analysis, except for strains X23, Y36 and Y37. Conclusion: RAPD technique is useful in taxonomy of lactic acid bacteria isolated from yak milk cheese. The accuracy of species identification can be improved by the combination of RAPD with other kinds of genotypic methods.

Key words: yak milk cheese;lactic acid bacteria;randomly amplified polymorphic DNA (RAPD);cluster analysis, genotype;genetic similarity coefficient

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