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Identification of an anaerobic bacterial consortium that degrades roxarsone
Author(s) -
Li Yasong,
Liu Yaci,
Zhang Zhaoji,
Fei Yuhong,
Tian Xia,
Cao Shengwei
Publication year - 2020
Publication title -
microbiologyopen
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.881
H-Index - 36
ISSN - 2045-8827
DOI - 10.1002/mbo3.1003
Subject(s) - anaerobic exercise , microbial population biology , microorganism , degradation (telecommunications) , microbial consortium , environmental chemistry , chemistry , biology , bacteria , physiology , telecommunications , genetics , computer science
The degradation of roxarsone, an extensively used organoarsenic feed additive, occurs quickly under anaerobic conditions with microorganisms playing an important role in its degradation. Here, an anaerobic bacterial consortium that effectively degraded roxarsone was isolated, and its degradation efficiency and community changes along a roxarsone concentration gradient under anaerobic conditions were assessed. We used batch experiments to determine the roxarsone degradation rates, as well as the bacterial community structure and diversity, at initial roxarsone concentrations of 50, 100, 200, and 400 mg/kg. The results showed that roxarsone was degraded completely within 28, 28, 36, and 44 hr at concentrations of 50, 100, 200, and 400 mg/kg, respectively. The anaerobic bacterial consortium displayed considerable potential to degrade roxarsone, as the degradation rate increased with increasing roxarsone concentrations. Roxarsone promoted microbial growth, and in turn, the microorganisms degraded the organoarsenic compound, with the functional bacterial community varying between different roxarsone concentrations. Lysinibacillus , Alkaliphilus , and Proteiniclasticum were the main genera composing the roxarsone‐degrading bacterial community.

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