Diverse aromatic-degrading bacteria present in a highly enriched autotrophic nitrifying sludge

The Science of the Total Environment
Haohao SunLin Ye

Abstract

Biotransformation of refractory organics by ammonia-oxidizing microorganisms in nitrifying sludge have been widely reported, while the contribution of heterotrophic bacteria in nitrifying sludge in the biotransformation and degradation process might be overlooked. Here, we provide metagenomic and metatranscriptomic evidences showing that heterotrophic bacteria in a highly enriched autotrophic nitrifying sludge could significantly contribute to the aromatic biotransformation and biodegradation. Diverse genes encoding enzymes for aromatic degradation were observed in an enriched autotrophic nitrifying sludge. These genes are involved in the degradation of at least 15 complex aromatics. Genome binning results showed that these genes were mainly carried by species in Bacteroidetes (Flavobacteriaceae and Sphingobacteriales), Alphaproteobacteria (Rhodobacter) and Betaproteobacteria (Bordetella, Acidovorax, Ramlibacter and Pusillimonas). According to the metatranscriptomic analysis, the overall expression of the potential aromatic-degrading genes was significantly upregulated, and almost all genes involved in phenol degradation were over expressed after the nitrifying sludge was exposed to phenol. Overall, our results suggest that cer...Continue Reading

Citations

Jan 8, 2021·Chemosphere·Rubén Trejo-CastilloAnne-Claire Texier
Jan 9, 2021·Applied Microbiology and Biotechnology·Gang WuHongqiang Ren
Nov 20, 2021·Journal of Microbiological Methods·Carla Lopez, Charles W Knapp

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