Transduction of Various R Factors by Phage P1 inEscherichia coliand by Phage P22 inSalmonella typhimurium

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Abstract
R factorsfi+andfi−, with various combinations of drug-resistance markers and isolated from independent sources, were transduced by phage P1kc inEscherichia coliand by phage P22 inSalmonella typhimurium. Usually the entire R factor was transduced by P1kc inE. coli, as indicated by the absence of segregation of the drug-resistance markers from their conjugal transferability. In contrast, the patterns of segregation of the drug-resistance markers and their conjugal transferability differed considerably among various R factors after transduction by P22 inS. typhimurium. Transduction frequencies varied among R factors in both transduction systems.