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  • Title: Lysogeny in Lactobacillus delbrueckii strains and characterization of two new temperate prolate-headed bacteriophages.
    Author: Suárez V, Zago M, Quiberoni A, Carminati D, Giraffa G, Reinheimer J.
    Journal: J Appl Microbiol; 2008 Nov; 105(5):1402-11. PubMed ID: 18713281.
    Abstract:
    AIMS: Frequency of lysogeny in Lactobacillus delbrueckii strains (from commercial and natural starters) and preliminary characterization of temperate bacteriophages isolated from them. METHODS AND RESULTS: Induction of strains (a total of 16) was made using mitomycin C (MC) (0.5 mug ml(-1)). For 37% of the MC-treated supernatants, it was possible to detect phage particles or presence of killing activity, but only two active bacteriophages were isolated. The two temperate phages isolated were prolate-headed phages which belonged to group c of Lact. delbrueckii bacteriophages classification. Different DNA restriction patterns were obtained for each phage, while the structural protein profiles and packaging sites were identical. Distinctive one-step growth curves were exhibited by each phage. An influence of calcium ions was observed for their lysis in broth but not on the adsorption levels. CONCLUSIONS: Our study showed that lysogeny is also present in Lact. delbrueckii strains, including commercial strains. SIGNIFICANCE AND IMPACT OF THE STUDY: Commercial strains could be lysogenic and this fact has a great practical importance since they could contribute to the dissemination of active-phage particles in industrial environments.
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