Abstract
A Pseudomonas aeruginosa, strain Ps5–70 which was mercury-resistant, was found to have a sex factor. This sex factor, designated as FP5 factor, mediated chromosome transfer by conjugation. Crosses between Ps5–70, FP5+ and PAO, FP2+ strain of Holloway were fertile, and Ps5–70 acted as the donor. Some of the recombinants between FP5+ and FP5– strains displayed maleness, and those recombinants usually acquired mercury resistance. So, transferability of FP5 factor itself and a very close association between the two determinants of FP5, one for fertility and the other for mercury resistance, were proved similar to the FP2 factor. Female sublines of Ps5–70 which behaved as recipients in intrastrain crosses were obtainable from cultures multiplied in the presence of acriflavin. Those females still retained mercury resistance. An R factor originated in P. aeruginosa interfered with the recombinant formation mediated by FP5 factor when the two episomes coexisted within a single cell.
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