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Mineralization of 2-chloro- and 2,5-dichlorobiphenyl by Pseudomonas sp. strain UCR2.

Pseudomonas sp. strain UCR2 was isolated from a multi-chemostat mating experiment between a chlorobenzoate-degrader, Pseudomonas aeruginosa strain JB2, and a chlorobiphenyl-degrader, Arthrobacter sp. strain B1Barc. Strain UCR2 differed from either of the parental organisms in that it grew on both 2-chloro- and 2,5-dichlorobiphenyl with concomitant release of chloride. Phenotypic typing by the Biolog system indicated that strain UCR2 shared greater similarity with strain JB2 (88%) than strain B1Barc (3%). In DNA:DNA hybridization experiments, genomic DNA from strain UCR2 hybridized with both strain JB2 and strain B1Barc, with the former pairing yielding a much stronger signal than the latter. In contrast, no hybridization whatsoever was observed when the parental organisms strains JB2 and B1Barc were probed against each other.