Abstract |
Superinfection immunity is found in the conjugal transfer of R factors between two fi(+) R factors and between two fi(-) R factors (fi = fertility inhibition), as we reported previously. In contrast, no reduction in the frequencies of transduction of an fi(+) R factor 222 was caused by the presence of fi(+) R factors in the recipients in transduction systems with phage P1kc in Escherichia coli K-12 and with phage P22 in Salmonella typhimurium LT-2. The absence of superinfection immunity in transduction may be due to the difference in the route of entry of the R factor. The frequencies of transduction of an fi(+) R factor were reduced, although slightly, by the presence of fi(-) R factors in the recipients. This reduction is probably due to host-controlled restriction of the entering fi(+) R factor by the fi(-) R factors in the recipients, since transduction of an fi(+) R factor by the transducing phage propagated on the strain carrying both fi(+) and fi(-) R factors was not reduced by the presence of homologous fi(-) R factors in the recipients. The fi(+) R factor 222, when transduced to the recipient strains carrying other R factors, recombined genetically at high frequencies with these resident R factors, regardless of their fi type.
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Authors | T Watanabe, S Sakaizumi, C Furuse |
Journal | Journal of bacteriology
(J Bacteriol)
Vol. 96
Issue 5
Pg. 1796-802
(Nov 1968)
ISSN: 0021-9193 [Print] United States |
PMID | 4882026
(Publication Type: Journal Article)
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Topics |
- Conjugation, Genetic
- Drug Resistance, Microbial
- Escherichia coli
- Extrachromosomal Inheritance
- Genetics, Microbial
- Recombination, Genetic
- Salmonella typhimurium
- Transduction, Genetic
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