Copyright 0 198, American Society for Microbiolos Properties of IncP-2 Plasmids of Pseudomonas spp.

Thirty IncP-2 R plasmids from isolates of Pseudomonas.spp. of diverse geographical oripns were- exIid for the production of resistance properUie*. All the plpmids determine4 reptAnce to teusite and all inhibited the pro-tion of certain DNA phages, a several patterns of phage inhibition were detected. Of the 30 plasmids, 29 determinpq regiFtance to streptomycin, 2$ determined resistance to mercuric ion, and 24,4etermined.resistance to. sulfon-amide. Resistance to other antibiotics, to compounds of arsenic, boron, or chronium, and to UV irradiation was less coofmon. The degradatfre plasmid CAM also belonged to this group. When CAW was introduced into e nts carrying an IncP-2 R plasmid, mcombinant plasmids were often formed inwhch antbiotic resistance and the abilty to grow on camphor were transferred topther to further recipients or were lost together in a strain in which IncP-2 plnids were unsiable. Such hybrid plasmid.formation was rec dep6n4hnt. CA$n-d,ther IncP-2 plasmids that determine UV light resistance demonstrated UV-enhnced, nonpolarized transfer of the Pseudomonas aereaginosa chromosome. By. awros