Biodegradation

, Volume 20, Issue 4, pp 521–531 | Cite as

Enrichment and identification of polycyclic aromatic compound-degrading bacteria enriched from sediment samples

  • Rachel M. Long
  • Hilary M. Lappin-Scott
  • Jamie R. Stevens
Original Paper

Abstract

The degradation of polycyclic aromatic compounds (PACs) has been widely studied. Knowledge of the degradation of PACs by microbial populations can be utilized in the remediation of contaminated sites. To isolate and identify PAC-degrading bacteria for potential use in future bioremediation programmes, we established a series of PAC enrichments under the same experimental conditions from a single sediment sample taken from a highly polluted estuarine site. Enrichment cultures were established using the pollutants: anthracene, phenanthrene and dibenzothiophene as a sole carbon source. The shift in microbial community structure on each of these carbon sources was monitored by analysis of a time series of samples from each culture using 16S rRNA polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE). Significantly, our findings demonstrate that shifts in the constituent species within each degradative community are directly attributable to enrichment with different PACs. Subsequently, we characterized the microorganisms comprising the degradative communities within each enrichment using 16S rRNA sequence data. Our findings demonstrate that the ability to degrade PACs is present in five divisions of the Proteobacteria and Actinobacteria. By determining the precise identity of the PAC-degrading bacterial species isolated from a single sediment sample, and by comparing our findings with previously published research, we demonstrate how bacteria with similar PAC degrading capabilities and 16S rRNA signatures are found in similarly polluted environments in geographically very distant locations, e.g., China, Italy, Japan and Hawaii. Such a finding suggests that geographical barriers do not limit the distribution of key PAC-degrading bacteria; this finding is in accordance with the Baas-Becking hypothesis “everything is everywhere; the environment selects” and may have significant consequences for the global distribution of PAC-degrading bacteria and their use in bioremediation.

Keywords

Anthracene Phenanthrene Dibenzothiophene PAHs PACs Bioremediation 

Notes

Acknowledgments

We gratefully acknowledge funding from Schlumberger Cambridge Research Ltd. Thanks to Dr. Corinne Whitby (Essex, UK) and Dr. Dalia Zakaria for helpful discussions. Many thanks also to Peter Splatt for excellent technical assistance.

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Rachel M. Long
    • 1
  • Hilary M. Lappin-Scott
    • 1
  • Jamie R. Stevens
    • 1
  1. 1.School of BiosciencesUniversity of ExeterExeterUK

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