A Fungal-Mediated Cryptic Selenium Cycle Linked to Manganese Biogeochemistry
Carla E. Rosenfeld, Mary Sabuda, Margaret Hinkle, Bruce R. James, Cara Santelli
Abstract
sp., we observed that aerobic Se(IV and VI) bioreduction to Se(0) and Se(-II) occurs simultaneously alongside the opposite redox biomineralization process of mycogenic Mn(II) oxidation to Mn oxides. Selenium bioreduction produced stable Se(0) nanoparticles and organoselenium compounds. However, mycogenic Mn oxides rapidly oxidized volatile Se products, recycling these compounds back to soluble forms. Given their abundance in natural systems, biogenic Mn oxides likely play an important role mediating Se biogeochemistry. Elucidating this cryptic Se cycle is essential for understanding and predicting Se behavior in diverse environmental systems.
Topics & Concepts
BiogeochemistryEnvironmental chemistrySeleniumManganeseChemistryBiomineralizationBiogeochemical cycleBioavailabilityRedoxGenetic algorithmInorganic chemistryEcologyBiologyOrganic chemistryAstrobiologyBioinformaticsSelenium in Biological SystemsMercury impact and mitigation studiesGeochemistry and Elemental Analysis