Abstract
Soils contaminated with o-xylene were more difficult to bioremediate than those contaminated with other BTEX hydrocarbons (benzene, toluene, ethylbenzene, m-xylene and p-xylene). In order to identify microorganisms responsible for o-xylene degradation in soil, microbial community structure analyses were carried out with two soil samples in the presence of o-xylene and mineral nutrients. In two different soil samples, Rhodococcus opacus became abundant. We were also able to isolate o-xylene degrading Rhodococcus species from these soil samples. A primer set was developed to specifically detect a cluster of this Rhodococcus group including isolated Rhodococcus strains, Rhodococcus opacus and Rhodococcus koreensis. The growth of this bacterial group in an o-xylene-contaminated soil was followed by competitive PCR (cPCR). The decrease in o-xylene clearly paralleled the growth of the Rhodococcus group.
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Acknowledgments
We are grateful to Yukie Inomata and Reiko Hirano for their technical assistance. We are also grateful to Asaka Matsuura for her advice about DNA extraction methods. This work was supported by the New Energy and Industrial Technology Development Organization (NEDO).
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Taki, H., Syutsubo, K., Mattison, R.G. et al. Identification and characterization of o-xylene-degrading Rhodococcus spp. which were dominant species in the remediation of o-xylene-contaminated soils. Biodegradation 18, 17–26 (2007). https://doi.org/10.1007/s10532-005-9030-x
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DOI: https://doi.org/10.1007/s10532-005-9030-x