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

Type Article
Date 2021-07
Language English
Author(s) Rontani Jean-François1, Amiraux Rémi1, 2, 3, Smik Lukas4, Wakeham Stuart G.5, Paulmier Aurélien6, Vaultier Frédéric1, Ha Sun-Yong7, Min Jun-Oh7, 8, Belt Simon T.4
Affiliation(s) 1 : Aix Marseille Université, Université de Toulon, CNRS/INSU/IRD, Mediterranean Institute of Oceanography (MIO), UM 110, 13288 Marseille, France
2 : Takuvik Joint International Laboratory, Laval University (Canada) - CNRS, Département de biologie, Université Laval, Québec G1V 0A6, Québec, Canada
3 : UMR 6539 Laboratoire des Sciences de l’Environnement Marin (CNRS, UBO, IRD, Ifremer) Institut Universitaire Européen de la Mer (IUEM) Plouzané, France
4 : Biogeochemistry Research Centre, School of Geography, Earth and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth, Devon PL4 8AA, UK
5 : Skidaway Institute of Oceanography, Savannah, Georgia, USA
6 : Laboratoire d'Etudes en Géophysique et Océanographie Spatiales (LEGOS), IRD/CNRS/UPS/CNES, Université de Toulouse, 31401 Toulouse Cedex, 9, France
7 : Division of Ocean Sciences, Korea Polar Research Institute, 26 Songdomirae-ro, Incheon, 21990, Republic of Korea
8 : Department of Marine Science and Convergence Technology, Hanyang University, 55 Hanyangdaehak-ro, Ansan, 15588, Republic of Korea
Source Science Of The Total Environment (0048-9697) (Elsevier BV), 2021-07 , Vol. 779 , P. 146363 (9p.)
DOI 10.1016/j.scitotenv.2021.146363
WOS© Times Cited 6
Keyword(s) Photodynamic effect, Senescent phytoplankton, Latitude, Polar regions, Solar irradiance

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.

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Rontani Jean-François, Amiraux Rémi, Smik Lukas, Wakeham Stuart G., Paulmier Aurélien, Vaultier Frédéric, Ha Sun-Yong, Min Jun-Oh, Belt Simon T. (2021). Type II photosensitized oxidation in senescent microalgal cells at different latitudes: Does low under-ice irradiance in polar regions enhance efficiency? Science Of The Total Environment, 779, 146363 (9p.). Publisher's official version : https://doi.org/10.1016/j.scitotenv.2021.146363 , Open Access version : https://archimer.ifremer.fr/doc/00685/79659/