Journal
WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY
Volume 29, Issue 11, Pages 1989-2002Publisher
SPRINGER
DOI: 10.1007/s11274-013-1362-9
Keywords
PAHs; TPHs; Bacterial diversity; Canonical correspondence analysis; PCA; T-RFLP
Categories
Funding
- Romanian Ministry of Labour, Family and Social Protection [POSDRU/88/1.5/S/60203]
- Research Programs Institute of Sapientia Foundation [1047/2006, 663/2007]
- Bolyai Janos Research Grant of the Hungarian Academy of Sciences
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Nowadays, because of substantial use of petroleum-derived fuels the number and extension of hydrocarbon polluted terrestrial ecosystems is in growth worldwide. In remediation of aforementioned sites bioremediation still tends to be an innovative, environmentally attractive technology. Although huge amount of information is available concerning the hydrocarbon degradation potential of cultivable hydrocarbonoclastic bacteria little is known about the in situ long-term effects of petroleum derived compounds on the structure of soil microbiota. Therefore, in this study our aim was to determine the long-term impact of total petroleum hydrocarbons (TPHs), volatile petroleum hydrocarbons (VPHs), total alkyl benzenes (TABs) as well as of polycyclic aromatic hydrocarbons (PAHs) on the structure of bacterial communities of four different contaminated soil samples. Our results indicated that a very high amount of TPH affected positively the diversity of hydrocarbonoclastic bacteria. This finding was supported by the occurrence of representatives of the alpha-, beta-, gamma-Proteobacteria, Actinobacteria, Flavobacteriia and Bacilli classes. High concentration of VPHs and TABs contributed to the predominance of actinobacterial isolates. In PAH impacted samples the concentration of PAHs negatively correlated with the diversity of bacterial species. Heavily PAH polluted soil samples were mainly inhabited by the representatives of the beta-, gamma-Proteobacteria (overwhelming dominance of Pseudomonas sp.) and Actinobacteria.
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