1887

Abstract

Aromatic hydrocarbons are among the main constituents of crude oil and represent a major fraction of biogenic hydrocarbons. Anthropogenic influences as well as biological production lead to exposure and accumulation of these toxic chemicals in the water column and sediment of marine environments. The ability to degrade these compounds has been demonstrated for oxygen- and sulphate-respiring marine micro-organisms. However, if and to what extent nitrate-reducing bacteria contribute to the degradation of hydrocarbons in the marine environment and if these organisms are similar to their well-studied freshwater counterparts has not been investigated thoroughly. Here we determine the potential of marine prokaryotes from different sediments of the Atlantic Ocean and Mediterranean Sea to couple nitrate reduction to the oxidation of aromatic hydrocarbons. Nitrate-dependent oxidation of toluene as an electron donor in anoxic enrichment cultures was elucidated by analyses of nitrate, nitrite and dinitrogen gas, accompanied by cell proliferation. The metabolically active members of the enriched communities were identified by RT-PCR of their 16S rRNA genes and subsequently quantified by fluorescence hybridization. In all cases, toluene-grown communities were dominated by members of the , followed in some enrichments by metabolically active alphaproteobacteria as well as members of the . From these enrichments, two novel denitrifying toluene-degrading strains belonging to the were isolated. Two additional toluene-degrading denitrifying strains were isolated from sediments from the Black Sea and the North Sea. These isolates belonged to the and . Serial dilutions series with marine sediments indicated that up to 2.2×10 cells cm were able to degrade hydrocarbons with nitrate as the electron acceptor. These results demonstrated the hitherto unrecognized capacity of alpha- and gammaproteobacteria in marine sediments to oxidize toluene using nitrate.

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2012-12-01
2019-10-19
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