Abstract
Two bacterial strains, the natural isolate Arthrobacter sp. FG1 and the engineered strain Pseudomonas putida PaW340/pDH5, were compared for their efficiency in the degradation of 4-chlorobenzoic acid in a slurry phase system. The recombinant strain was obtained by cloning the Arthrobacter sp. FG1 dehalogenase encoding genes in P. putida PaW340. In the slurry inoculated with pre-adapted cultures of Arthrobacter sp. FG1, the 4-chlorobenzoic acid degradation was found to be slower than that observed in the slurry inoculated with the recombinant strain P. putida PaW340/pDH5, regardless of the presence or absence of soil indigenous bacteria. Slurry inoculated with mixed cultures of Arthrobacter sp. FG1 and the 4-hyroxybenzoic acid degrader P. putida PaW340 did not show any improvement in 4-chlorobenzoic acid degradation.
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