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Transfer of sucrose fermentation ability, nisin production, and nisin resistance from Streptococcus lactis to S. lactis and Streptococcus lactis subsp. diacetylactis occurred between cells immobilized on nitrocellulose filters in the presence of DNase. Transconjugants were able to act as donors to transfer the Suc-Nis phenotype in subsequent mating. No changes in sensitivity to lytic phage c2 were noted in S. lactis transconjugants. However, temperature-independent restriction of lytic phage 18-16 was noted in transconjugants of S. lactis subsp. diacetylactis 18-16. Adsorption studies with phage-resistant transconjugants showed that resistance was not due to lack of adsorption by the lytic phage. Physical evidence for the presence of introduced plasmid DNA was not found in lysates of transconjugants.

Transfer of Sucrose-Fermenting Ability and Nisin Production Phenotype among Lactic Streptococci