Type II photosensitized oxidation in senescent microalgal cells at different latitudes: Does low under-ice irradiance in polar regions enhance efficiency?

Comparison of Type II photosensitized oxidation of lipids (the photodynamic effect) and photodegradation of chlorophyll (sensitizer photobleaching) in samples of particulate matter collected previously from locations representing a diverse range of latitudes reveals an enhancement of the photooxidat...

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Bibliographic Details
Published in:The Science of the total environment 2021-07, Vol.779, p.146363-146363, Article 146363
Main Authors: Rontani, Jean-François, Amiraux, Rémi, Smik, Lukas, Wakeham, Stuart G., Paulmier, Aurélien, Vaultier, Frédéric, Sun-Yong, Ha, Jun-oh, Min, Belt, Simon T.
Format: Article
Language:English
Subjects:
Latitude
Ocean, Atmosphere
Photodynamic effect
Polar regions
Sciences of the Universe
Senescent phytoplankton
Solar irradiance
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Summary:Comparison of Type II photosensitized oxidation of lipids (the photodynamic effect) and photodegradation of chlorophyll (sensitizer photobleaching) in samples of particulate matter collected previously from locations representing a diverse range of latitudes reveals an enhancement of the photooxidation of lipids at the expense of chlorophyll photodegradation in the polar regions. The efficiency of the photodynamic effect appears to be particularly high in sinking particles collected under sea ice and is attributed to the rapid settling of highly aggregated sympagic algae to depths of low light transmission favouring the photodynamic effect at the expense of photobleaching of the sensitizer. Paradoxically, the low efficiency of Type II photosensitized oxidation of lipids observed in temperate and equatorial regions is associated with high solar irradiances in these regions. Type II photosensitized oxidation of lipids in senescent phytoplankton seems thus to be strongly dependent of the intensity of solar irradiance. [Display omitted] •Photodynamic effect efficiency in POM is compared at different latitudes.•Efficiency of lipid photooxidation is low in temperate and equatorial regions.•Type II photosensitized oxidation of lipids is highest in polar regions.•Photodynamic effect is particularly efficient in particles sinking under sea ice.•Photooxidation of lipids in senescent phytoplankton is favoured at low irradiance.
ISSN:0048-9697
1879-1026
DOI:10.1016/j.scitotenv.2021.146363