Degradation of 2,4,6-tribromophenol and 2,4,6-trichlorophenol by aerobic heterotrophic bacteria present in psychrophilic lakes |
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Authors: | José Aguayo Ricardo Barra José Becerra Miguel Martínez |
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Affiliation: | (1) Laboratorio de Microbiología Básica y Biorremediación, Departamento de Microbiología, Facultad de Ciencias Biológicas, Universidad de Concepción, Casilla 160-C, Concepción, Chile;(2) Unidad de Sistemas de Acuáticos, Centro EULA-Chile, Universidad de Concepción, Casilla 160-C, Concepción, Chile;(3) Laboratorio de Fitoquímica, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Casilla 160-C, Concepción, Chile |
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Abstract: | Halogenated compounds have been incorporated into the environment, principally through industrial activities. Nonetheless, microorganisms able to degrade halophenols have been isolated from neither industrial nor urban environments. In this work, the ability of bacterial communities from oligotrophic psychrophilic lakes to degrade 2,4,6-tribromophenol and 2,4,6-trichlorophenol, and the presence of the genes tcpA and tcpC described for 2,4,6-trichlorophenol degradation were investigated. After 10 days at 4°C, the microcosms showed the ability to degrade both halophenols. Nonetheless, bacterial strains isolated from the microcosms did not degrade any of the halophenols, suggesting that the degradation was done by a bacterial consortium. Genes tcpA and tcpC were not detected. Results demonstrated that the bacterial communities present in oligotrophic psycrophilic lakes have the ability to degrade halophenolic compounds at 4°C and the enzymes involved in their degradation could be codified in genes different to those described for bacteria isolated from environments contaminated by industrial activities. |
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Keywords: | Bromophenol Biodegradation Bacterial consortium Psychrophilic |
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