Dissimilatory iodate-reducing microorganisms inhabit marine oxygen minimum zones

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ID: 319110
2026
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Abstract
Abstract Based on theoretical thermodynamic calculations, microbial IO3− reduction precedes NO3− reduction, and it was previously proposed that dissimilatory iodate-reducing microorganisms (DIRMs) inhabit a unique niche above marine oxygen minimum zones (OMZs). Here we demonstrate that dissimilatory IO3− reduction lags behind NO3− reduction in two representative strains Azonexus hydrophilus NCP973 and Denitromonas iodatirespirans IR-12. Correspondingly, the functional genes idrABP1P2 for DIRMs were found to be exclusively distributed across depth profiles of global OMZs where NO3− reduction is active. Combined with widespread detection and heterologous expression of the idrABP1P2 of MAGs from the OMZs, these findings suggest that DIRMs inhabit marine OMZs and contribute to I− production and accumulation. As OMZs expand under global warming, DIRMs could enhance volatile iodine fluxes to the atmosphere by producing the precursor I−. Given the environmental health importance of atmospheric iodine, integrating this pathway into marine iodine biogeochemical models will improve our capability of understanding and predicting the future changes in oceanic iodine emissions.
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openalex_W7166550481 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Li J, Zhou Jiang, Xueyun Li, Wenjie Fang, Yongguang Jiang, Yidan Hu, Y S Dong, X C Xie, Liang Shi, Andreas Kappler, Yue Wang
Journal national science review
Year 2026
DOI
10.1093/nsr/nwag397
URL
https://doi.org/10.1093/nsr/nwag397
Keywords Keywords not found

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