Microbial community mediates hydroxyl radical production in soil slurries by iron redox transformation.
Water Res
; 220: 118689, 2022 Jul 15.
Article
em En
| MEDLINE
| ID: mdl-35661513
ABSTRACT
The generation of reactive oxygen species (ROS) mediated by minerals and/or microorganisms plays a vital but underappreciated role in affecting carbon and nutrient cycles at soil-water interfaces. It is currently unknown which interactions between microbial communities and iron (Fe) minerals produce hydroxyl radical (HOâ¢), which is the strongest oxidant among ROS. Using a series of well-controlled anoxic incubations of soil slurries, we demonstrated that interactions between microbial communities and Fe minerals synergistically drove HO⢠production (up to â¼100 nM after 21-day incubation). Microorganisms drove HO⢠generation in anoxic environments predominantly by modulating iron redox transformation that was more prominent than direct production of ROS by microorganisms. Among the microbial communities, Geobacter, Paucimonas, Rhodocyclaceae_K82, and Desulfotomaculum were the key genera strongly affecting HO⢠production. In manured soils, the former two species had higher abundances and were crucial for HO⢠production. In contrast, the latter two species were mainly abundant and important in soils with mineral fertilizers. Our study suggests that abundant highly reactive oxidant HO⢠can be generated in anoxic environments and the microbial community-mediated redox transformations of iron (oxyhydr)oxides may be responsible for the HO⢠production. These findings shed light on the microbial generation of HO⢠in fluctuating redox environments and on consequences for global C and nutrient cycling.
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MEDLINE
Assunto principal:
Microbiota
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Ferro
Idioma:
En
Ano de publicação:
2022
Tipo de documento:
Article