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Sistema de Información Científica Redalyc
Red de Revistas Científicas de América Latina y el Caribe, España y Portugal

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The activity and diversity of a groundwater bacterial community was studied during the degradation of benzene in samples from a BTEX-contaminated aquifer (SIReN, UK) through the use of denaturing gradient gel electrophoresis (DGGE), followed by excision and sequencing of dominant bands. Rapid aerobic benzene degradation occurred in all samples, with 60-70 % degradation of benzene. DGGE analysis revealed that unique, stable bacterial communities were formed in each sample. Pseudomonas putida and Acidovorax delafieldii were identified in groundwater samples 308s and W6s respectively, suggesting they are the important taxa involved in the degradation of benzene. Further work based on stable isotope probing (SIP) of RNA using 13C benzene was carried out. Prominent bands were identified as Acidovorax and Malikia genera; the latter is very similar to the benzene-degrader Hydrogenophaga, which confirms the presence of active benzene degraders in the groundwater samples. The identification of the prominent communities provides knowledge of the bioremediation processes occurring in situ and the potential to enhance degradation. This study highlights the potential of combining community fingerprinting techniques, such as DGGE, together with SIP.

Palabras clave: Acioaerobic benzene degradation, SIP, groundwater, population dynamics.
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Universidad Autónoma del Estado de México
Sistema de Información Científica Redalyc ®
Versión 3.0 | 2017
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