Reactive oxygen species in the world ocean and their impacts on marine ecosystems

Morris, Jeffrey; Rose, Arthur W.; Lu, Zhiying

doi:10.1016/j.redox.2022.102285

Cited by 66 publications

(27 citation statements)

References 241 publications

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“…Here we seek to extend these findings and test if externally added

{normalO}_{2}^{-}

can also enhance 33 P release rate and 33 P uptake. Since

{normalO}_{2}^{-}

is highly reactive, capable of reducing and oxidizing Fe and additional metals and can even react with itself (dismutate), it is hard to experimentally control this system (Morris et al 2022). Moreover, given the low solubility of Fe in seawater, Fe may quickly reprecipitate, possibly along with 33 P (Gunnars et al 2002).…”

Section: Resultsmentioning

confidence: 99%

Co‐acquisition of mineral‐bound iron and phosphorus by natural Trichodesmium colonies

Shaked

Beer

Wang

et al. 2023

Limnology & Oceanography

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Low iron (Fe) and phosphorus (P) ocean regions are often home to the globally important N 2 -fixing cyanobacterium Trichodesmium spp., which are physiologically adapted to Fe/P co-limitation. Given Trichodesmium's eminent ability to capture particles and the common associations between Fe and P in sediments and aerosols, we hypothesized that mineral bio-dissolution by Trichodesmium spp. may enable them to co-acquire Fe and P. We present a new sensitive assay to determine P uptake from particles, utilizing 33 P-labeled ferrihydrite. To validate the method, we examined single natural Trichodesmium thiebautii colonies in a high-resolution radiotracer ß-imager, identifying strong colony-mineral interactions, efficient removal of external 33 P-labeled ferrihydrite, and elevated 33 P uptake in the colony core. Next, we determined bulk P uptake rates, comparing natural Red Sea colonies and P-limited Trichodesmium erythraeum cultures. Uptake rates by natural and cultured Trichodesmium were similar to P release rates from the mineral, suggesting tight coupling between dissolution and uptake. Finally, synthesizing P-ferrihydrite labeled with either 33 P or 55 Fe, we probed for Fe/P co-extraction by common microbial mineral solubilization pathways. Dissolution rates of ferrihydrite were accelerated by exogenous superoxide and strong Fe-chelator and subsequently enhanced 33 P release and uptake by Trichodesmium. Our method and findings can facilitate further Fe/P co-acquisition studies and highlight the importance of biological mechanisms and microenvironments in controlling bioavailability and nutrient fluxes from particles.

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“…Here we seek to extend these findings and test if externally added

{normalO}_{2}^{-}

can also enhance 33 P release rate and 33 P uptake. Since

{normalO}_{2}^{-}

Section: Resultsmentioning

confidence: 99%

Co‐acquisition of mineral‐bound iron and phosphorus by natural Trichodesmium colonies

Shaked

Beer

Wang

et al. 2023

Limnology & Oceanography

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“…H 2 O 2 is also common in marine surface water, where it is produced by solar radiation ( 27 ). The concentration of H 2 O 2 in marine surface water is in the 0.02 to 0.80 μM range, although it might be higher near strong producers, such as phytoplankton ( 28 , 29 ).…”

Section: Introductionmentioning

confidence: 99%

Oxidative Stress Regulates a Pivotal Metabolic Switch in Dimethylsulfoniopropionate Degradation by the Marine Bacterium Ruegeria pomeroyi

et al. 2022

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“…Moreover, due to the high bond‐breaking kinetic barrier in the absence of free transition metal ions, [ 3 ] H 2 O 2 has a long retention time in seawater of the order of hours to days. [ 2 ] Its concentration is related to that of other ROS such as OH . .…”

Section: Introductionmentioning

confidence: 99%

Calcifying Coccolithophore: An Evolutionary Advantage Against Extracellular Oxidative Damage

Yang

Batchelor‐McAuley

Barton

et al. 2023

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The evolutionary advantages afforded by phytoplankton calcification remain enigmatic. In this work, fluoroelectrochemical experiments reveal that the presence of a CaCO3 shell of a naturally calcifying coccolithophore, Coccolithus braarudii, offers protection against extracellular oxidants as measured by the time required for the switch‐off in their chlorophyll signal, compared to the deshelled equivalents, suggesting the shift toward calcification offers some advantages for survival in the surface of radical‐rich seawater.

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Reactive oxygen species in the world ocean and their impacts on marine ecosystems

Cited by 66 publications

References 241 publications

Co‐acquisition of mineral‐bound iron and phosphorus by natural Trichodesmium colonies

Co‐acquisition of mineral‐bound iron and phosphorus by natural Trichodesmium colonies

Oxidative Stress Regulates a Pivotal Metabolic Switch in Dimethylsulfoniopropionate Degradation by the Marine Bacterium Ruegeria pomeroyi

Calcifying Coccolithophore: An Evolutionary Advantage Against Extracellular Oxidative Damage

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