FERTILITY FACTORS AND GENETIC LINKAGE IN PSEUDOMONAS AERUGINOSA

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Abstract
Strains of P. aeruginosa possessing the pseudomonad fertility factor FP vary in their ability to transmit it to strains not having it (FP-). Unlike the F factor in E. coli, FP is little affected by acridines or metal salts. Attempts to convert FP+ strains into a strain with a high frequency of recombination (Hfr) have been unsuccessful. This may be due to instability of the Hfr form in P. aeruginosa. The FP agent influences segregation and in an FP- x FP+ cross, transfer of genetic material is unidirectional from the FP+ parent to the FP- parent. The segregation of FP in FP- x FP+ crosses depends upon the relative infectivity of the FP+ parent. FP+ x FP- crosses between parents marked with auxotrophic, drug resistance and phage resistance markers have shown linkage and the seven loci studied have been placed in one linkage group.

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