Diurnal Fe(II)/Fe(III) cycling and enhanced O2 production in a simulated Archean marine oxygen oasis
| Autor: | James M. Byrne, Nicole Frankenberg-Dinkel, Michelle M. Gehringer, J. Sorwat, Achim J. Herrmann |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
0301 basic medicine
Cyanobacteria Aquatic Organisms Iron Science General Physics and Astronomy chemistry.chemical_element 010502 geochemistry & geophysics Photosynthesis Models Biological 01 natural sciences Rust Oxygen Article General Biochemistry Genetics and Molecular Biology Atmosphere 03 medical and health sciences Seawater 0105 earth and related environmental sciences Multidisciplinary Environmental microbiology biology Chemistry Chlorophyll A Great Oxygenation Event General Chemistry Biogeochemistry Early Earth biology.organism_classification Archaea Anoxic waters Circadian Rhythm 030104 developmental biology Environmental chemistry |
| Zdroj: | Nature Communications, Vol 12, Iss 1, Pp 1-11 (2021) Nature Communications |
| ISSN: | 2041-1723 |
| Popis: | The oxygenation of early Earth’s atmosphere during the Great Oxidation Event, is generally accepted to have been caused by oceanic Cyanobacterial oxygenic photosynthesis. Recent studies suggest that Fe(II) toxicity delayed the Cyanobacterial expansion necessary for the GOE. This study investigates the effects of Fe(II) on two Cyanobacteria, Pseudanabaena sp. PCC7367 and Synechococcus sp. PCC7336, in a simulated shallow-water marine Archean environment. A similar Fe(II) toxicity response was observed as reported for closed batch cultures. This toxicity was not observed in cultures provided with continuous gaseous exchange that showed significantly shorter doubling times than the closed-culture system, even with repeated nocturnal addition of Fe(II) for 12 days. The green rust (GR) formed under high Fe(II) conditions, was not found to be directly toxic to Pseudanabaena sp. PCC7367. In summary, we present evidence of diurnal Fe cycling in a simulated shallow-water marine environment for two ancestral strains of Cyanobacteria, with increased O2 production under anoxic conditions. Cyanobacterial photosynthesis is thought to have oxygenated Earth’s atmosphere during the Great Oxidation Event, but these organisms had to overcome the toxic effects of iron. Here the authors simulate Archaean conditions in Cyanobacterial cultures and find that gas exchange and rust formation alleviated iron toxicity. |
| Databáze: | OpenAIRE |
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