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Appl Environ Microbiol. 1991 January; 57(1): 260-266

Survival in soils of an herbicide-resistant Pseudomonas putida strain bearing a recombinant TOL plasmid.

J L Ramos, E Duque and M I Ramos-Gonzalez

Department of Plant Biochemistry, Consejo Superior de Investigaciones Cientificas, Granada, Spain.

ABSTRACT

Pseudomonas putida EEZ15(pWW0-EB62) is a phosphinothricin (PPT)-resistant strain with a recombinant TOL plasmid which allows the strain to grow on p-ethylbenzoate. The survival of this strain in sterile agricultural soils depends on the physicochemical properties of the soil. The recombinant pWW0-EB62 plasmid and its catabolic functions were stable for periods of up to 1 month in bacteria introduced in unamended soils and only conferred selective advantage to the host bacteria without the plasmid or with the natural pWW0 plasmid when the soils were amended with low amounts of p-ethylbenzoate. The addition to soils of aromatics that are cometabolized by P. putida EEZ15(pWW0-EB62) had a detrimental effect on the survival of the bacteria, whereas low amounts of aromatics that are not metabolized by this bacterium had no effect on their survival. Survival of P. putida EEZ15(pWW0-EB62) was better at 4 and 25 degrees C than at 37 degrees C. The host bacterium carrying the recombinant pWW0-EB62 plasmid was established in unsterile soils.

Appl Environ Microbiol. 1991 January; 57(1): 260-266




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