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Isolation, characterization and bioaugmentation of an acidotolerant 1,2-dichloroethane respiring Desulfitobacterium species from a low pH aquifer.

TitleIsolation, characterization and bioaugmentation of an acidotolerant 1,2-dichloroethane respiring Desulfitobacterium species from a low pH aquifer.
Publication TypeJournal Article
Year of Publication2019
AuthorsLow, A, Zhao, S, Rogers, MJ, Zemb, O, Lee, M, He, J, Manefield, M
JournalFEMS Microbiol Ecol
Volume95
Issue5
Date Published2019 May 01
ISSN1574-6941
Abstract

A Desulfitobacterium sp. strain AusDCA of the Peptococcaceae family capable of respiring 1,2-dichloroethane (1,2-DCA) to ethene anaerobically with ethanol or hydrogen as electron donor at pH 5.0 with optimal range between pH 6.5-7.5 was isolated from an acidic aquifer near Sydney, Australia. Strain AusDCA is distant (94% nucleotide identity) from its nearest phylogenetic neighbor, D. metallireducens, and could represent a new species. Reference gene-based quantification of growth indicated a doubling time of 2 days in cultures buffered at pH 7.2, and a yield of 7.66 (± 4.0) × 106 cells µmol-1 of 1,2-DCA. A putative 1,2-DCA reductive dehalogenase was translated from a dcaAB locus and had high amino acid identity (97.3% for DcaA and 100% for DcaB) to RdhA1B1 of the 1,2-DCA respiring Dehalobacter strain WL. Proteomic analysis confirmed DcaA expression in the pure culture. Dehalogenation of 1,2-DCA (1.6 mM) was observed in batch cultures established from groundwater at pH 5.5 collected 38 days after in situ bioaugmentation but not in cultures established with groundwater collected at the same time from wells not receiving bioaugmentation. Overall, strain AusDCA can tolerate lower pH than previously characterized organohalide respiring bacteria and remained viable in groundwater at pH 5.5.

DOI10.1093/femsec/fiz055
Alternate JournalFEMS Microbiol. Ecol.
PubMed ID30980656