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Applied and Environmental Microbiology, July 1999, p. 3056-3063, Vol. 65, No. 7
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Microbial Communities Associated with Anaerobic Benzene Degradation in a Petroleum-Contaminated Aquifer

Juliette N. Rooney-Varga,1,dagger Robert T. Anderson,1 Jocelyn L. Fraga,1,Dagger David Ringelberg,2 and Derek R. Lovley1,*

Department of Microbiology, University of Massachusetts, Amherst, Massachusetts 01003,1 and Waterways Experiment Station, Dyntel Corp., Vicksburg, Mississippi 391802

Received 15 December 1998/Accepted 19 April 1999

Microbial community composition associated with benzene oxidation under in situ Fe(III)-reducing conditions in a petroleum-contaminated aquifer located in Bemidji, Minn., was investigated. Community structure associated with benzene degradation was compared to sediment communities that did not anaerobically oxidize benzene which were obtained from two adjacent Fe(III)-reducing sites and from methanogenic and uncontaminated zones. Denaturing gradient gel electrophoresis of 16S rDNA sequences amplified with bacterial or Geobacteraceae-specific primers indicated significant differences in the composition of the microbial communities at the different sites. Most notable was a selective enrichment of microorganisms in the Geobacter cluster seen in the benzene-degrading sediments. This finding was in accordance with phospholipid fatty acid analysis and most-probable-number-PCR enumeration, which indicated that members of the family Geobacteraceae were more numerous in these sediments. A benzene-oxidizing Fe(III)-reducing enrichment culture was established from benzene-degrading sediments and contained an organism closely related to the uncultivated Geobacter spp. This genus contains the only known organisms that can oxidize aromatic compounds with the reduction of Fe(III). Sequences closely related to the Fe(III) reducer Geothrix fermentans and the aerobe Variovorax paradoxus were also amplified from the benzene-degrading enrichment and were present in the benzene-degrading sediments. However, neither G. fermentans nor V. paradoxus is known to oxidize aromatic compounds with the reduction of Fe(III), and there was no apparent enrichment of these organisms in the benzene-degrading sediments. These results suggest that Geobacter spp. play an important role in the anaerobic oxidation of benzene in the Bemidji aquifer and that molecular community analysis may be a powerful tool for predicting a site's capacity for anaerobic benzene degradation.

* Corresponding author. Mailing address: 203 N Morrill Science Center IV N, Department of Microbiology, University of Massachusetts, Amherst, MA 01003. Phone: (413) 545-9651. Fax: (413) 545-1578. E-mail: dlovley{at}microbio.umass.edu.

dagger Present address: Department of Biological Sciences, University of Massachusetts, Lowell, MA 01854.

Dagger Present address: Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, NC 27599.

Applied and Environmental Microbiology, July 1999, p. 3056-3063, Vol. 65, No. 7
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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