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Appl Environ Microbiol. 1973 February; 25(2): 305-308
Copyright © 1973 American Society for Microbiology. All Rights Reserved.

Lysogeny in Lactic Streptococci Producing and Not Producing Nisin

Witold Kozak, Marianna Rajchert-Trzpil, Jolanta Zajdel and Wadysaw T. Dobrzaski

Department of Molecular Genetics, Institute of Biostructure, Medical Academy, Warsaw, 02-004 Poland

ABSTRACT

Eighty-seven strains of lactic streptococci (46 of Streptococcus lactis, 24 of S. diacetilactis, and 17 of S. cremoris) were tested for lysogeny; 12 S. lactis strains produced nisin. Lysogeny was found in five S. lactis strains (two of them were nisin producers) and in two S. diacetilactis strains. Four S. lactis and two S. diacetilactis lysogens liberated phages both spontaneously and after ultraviolet treatment, and one S. lactis strain liberated phages spontaneously only. No lysogens were found among the S. cremoris strains tested. An initial characterization of the lysogens and their phages was made. The lytic spectrum of some of the examined phages was very narrow (homospecific), whereas that of others was wide, including strains of the three investigated species.