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Khan MI, Yoo K, Kim S, Cheema SA, Bashir S, Park J. A Sporolactobacillus-, Clostridium-, and Paenibacillus- Dominant Microbial Consortium Improved Anaerobic RDX Detoxification by Starch Addition. J Microbiol Biotechnol 2020; 30:839-847. [PMID: 32160699 PMCID: PMC9728379 DOI: 10.4014/jmb.1910.10034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Accepted: 03/05/2020] [Indexed: 12/15/2022]
Abstract
In the present study, an anaerobic microbial consortium for the degradation of hexahydro-1,3,5- trinitro-1,3,5-triazine (RDX) was selectively enriched with the co-addition of RDX and starch under nitrogen-deficient conditions. Microbial growth and anaerobic RDX biodegradation were effectively enhanced by the co-addition of RDX and starch, which resulted in increased RDX biotransformation to nitroso derivatives at a greater specific degradation rate than those for previously reported anaerobic RDX-degrading bacteria (isolates). The accumulation of the most toxic RDX degradation intermediate (MNX [hexahydro-1-nitroso-3,5-dinitro-1,3,5-triazine]) was significantly reduced by starch addition, suggesting improved RDX detoxification by the co-addition of RDX and starch. The subsequent MiSeq sequencing that targeted the bacterial 16S rRNA gene revealed that the Sporolactobacillus, Clostridium, and Paenibacillus populations were involved in the enhanced anaerobic RDX degradation. These results suggest that these three bacterial populations are important for anaerobic RDX degradation and detoxification. The findings from this work imply that the Sporolactobacillus, Clostridium, and Paenibacillus dominant microbial consortium may be valuable for the development of bioremediation resources for RDX-contaminated environments.
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Affiliation(s)
- Muhammad Imran Khan
- Department of Civil and Environmental Engineering, College of Engineering, Yonsei University, Seoul 03722, Republic of Korea,Institute of Soil and Environmental Sciences, University of Agriculture, Faisalabad 38040, Pakistan,Department of Isotope Biogeochemistry, Helmholtz Centre for Environmental Research- UFZ, 0318 Leipzig, Germany
| | - Keunje Yoo
- Department of Civil and Environmental Engineering, College of Engineering, Yonsei University, Seoul 03722, Republic of Korea,Department of Environmental Engineering, College of Engineering, Korea Maritime and Ocean University, Busan 49112, Republic of Korea
| | - Seonghoon Kim
- Department of Civil and Environmental Engineering, College of Engineering, Yonsei University, Seoul 03722, Republic of Korea
| | - Sardar Alam Cheema
- Department of Agronomy, University of Agriculture, Faisalabad 8040, Pakistan
| | - Safdar Bashir
- Institute of Soil and Environmental Sciences, University of Agriculture, Faisalabad 38040, Pakistan
| | - Joonhong Park
- Department of Civil and Environmental Engineering, College of Engineering, Yonsei University, Seoul 03722, Republic of Korea,Corresponding author Phone: +82-2-2123-7768 Fax: +82-2-312-5798 E-mail:
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