Molecular identification and characterization of indigenous bacterial strains isolated from soils around some oil refineries in Iran

Document Type : Original Article

Authors

1 PhD Student, Department of Natural Resources, Isfahan University of Technology, Isfahan, 8415683111, Iran

2 Associate Professor, Department of Natural Resources, Isfahan University of Technology, Isfahan, 8415683111, Iran

3 Lecturer, Department of Microbiology, Islamic Azad University, Falavarjan Branch, Isfahan, Iran

Abstract

One of the main causes of soil pollution is the release of crude oil into the environment. Indigenous microorganisms with the capability of biodegrading hydrocarbon components can be used to improve the efficiency of microbial bioremediation technology. Here, oil-contaminated soils were collected from five oil refineries (Abadan, Isfahan, Tehran, Tabriz and Shiraz) for screening and isolation of geographically adaptive indigenous oil-degrading bacteria. Bacterial colonies from oil-contaminated soil samples were isolated, which were able to grow in a medium containing crude oil, light, and heavy diesel, as a sole carbon source. Twelve strains were isolated, purified, and identified, using the 16S rRNA gene sequencing analysis. The isolates belonged to five species, including Achromobacter spanius, Klebsiella quasipneumoniae, Ochrobactrum intermedium, Citrobacter amalonaticus, Pseudomonas aeruginosa. These bacterial strains were capable of growing in media containing crude oil, light and heavy diesel for 7 to 9 days and had the potential for biosurfactant production. These bacterial strains can be considered as geographically adaptive bacteria, creating preliminary data for further research to utilize their bioremediation potential.

Keywords

References

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Dry Land Soil Research (DLSR)
Volume 1, Issue 1
September 2022
Pages 49-56

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