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Response of soil bacterial communities to high petroleum content in the absence of remediation procedures

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Abstract

Oil spills are events that frequently lead to petroleum pollution. This pollution may cause stress to microbial communities, which require long adaption periods. Soil petroleum pollution is currently considered one of the most serious environmental problems. In the present work, processes occurring in the bacterial communities of three soil samples with different physicochemical characteristics, artificially polluted with 12% of crude oil, were investigated in 120-day laboratory experiment. It was found that the total petroleum hydrocarbon content did not decrease during this time; however, the proportion of petroleum fractions was altered. Petroleum pollution led to a short-term decrease in the bacterial 16S rRNA gene copy number. On the basis of amplicon sequencing analysis, it was concluded that bacterial community successions were similar in the three soils investigated. Thus, the phyla Actinobacteria and Proteobacteria and candidate TM7 phylum (Saccaribacteria) were predominant with relative abundances ranging from 35 to 58%, 25 to 30%, and 15 to 35% in different samples, respectively. The predominant operational taxonomic units (OTUs) after pollution belonged to the genera Rhodococcus and Mycobacterium, families Nocardioidaceae and Sinobacteraceae, and candidate class ТМ7-3. Genes from the alkIII group encoding monoxygenases were the most abundant compared with other catabolic genes from the alkI, alkII, GN-PAH, and GP-PAH groups, and their copy number significantly increased after pollution. The copy numbers of expressed genes involved in the horizontal transfer of catabolic genes, FlgC, TraG, and OmpF, also increased after pollution by 11–33, 16–63, and 11–71 times, respectively. The bacterial community structure after a high level of petroleum pollution changed because of proliferation of the cells that initially were able to decompose hydrocarbons, and in the second place, because proliferation of the cells that received these catabolic genes through horizontal transfer.

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Data availability

Sequence data that support the findings of this study have been deposited in the National Center for Biotechnological Information repository with the accession numbers SRR11798602-SRR11798643 (https://www.ncbi.nlm.nih.gov/sra/SRR11798602). Another datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Funding

This study was funded by Russian Science Foundation (grant number 17–74–20183).

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Contributions

Conceptualization: Polina Galitskaya; methodology: Polina Kuryntseva; formal analysis and investigation: Liliya Biktasheva, Polina Kuryntseva; writing—original draft preparation: Polina Galitskaya; writing—review and editing: Polina Galitskaya, Svetlana Selivanovskaya; funding acquisition: Polina Galitskaya; supervision: Svetlana Selivanovskaya.

Corresponding author

Correspondence to Liliya Biktasheva.

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The authors declare that they have no competing interests.

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Responsible Editor: Robert Duran

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Galitskaya, P., Biktasheva, L., Kuryntseva, P. et al. Response of soil bacterial communities to high petroleum content in the absence of remediation procedures. Environ Sci Pollut Res 28, 9610–9627 (2021). https://doi.org/10.1007/s11356-020-11290-1

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  • DOI: https://doi.org/10.1007/s11356-020-11290-1

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