The Role of Sustained Photoprotective Non-photochemical Quenching in Low Temperature and High Light Acclimation in the Bloom-Forming Arctic Diatom Thalassiosira gravida

Type Article
Date 2018-10
Language English
Author(s) Lacour ThomasORCID1, Lariviere Jade, Ferland Joannie, Bruyant Flavienne, Lavaud Johann, Babin Marcel
Affiliation(s) 1 : Univ Laval, Takuvik Joint Int Lab, CNRS, Pavillon Alexandre Vachon, Quebec City, PQ, Canada.
Source Frontiers In Marine Science (2296-7745) (Frontiers Media Sa), 2018-10 , Vol. 5 , N. 354 , P. 16p.
DOI 10.3389/fmars.2018.00354
WOS© Times Cited 22
Keyword(s) Arctic diatom, photosynthesis, sustained NPQ, irradiance, temperature
Abstract

Thalassiosira gravida is a major Arctic diatom responsible for the under-ice spring bloom. We investigated T. gravida physiological plasticity growing it at two temperatures (0 and 5°C) and under different light intensities typically found in its natural environment. T. gravida showed remarkable thermal- and photo-acclimatory plasticity including: low light saturation parameter for growth (KE) and photosynthesis (EK), low μmax but relatively high Chl a/C, low C/N, and decreasing light-saturated carbon fixation rate (PmC) with increasing growth irradiance. T. gravida also showed remarkable photoprotective features, namely a strong sustained non-photochemical quenching (NPQs, hour kinetics relaxation) supported by a high amount of xanthophyll cycle pigments. T. gravida growth remained possible under a wide range of irradiances but photosynthetic plasticity was higher at moderately low light (up to ~50 μmol photons m−2 s−1), nevertheless corresponding to the mean in situ conditions under which it predominates, i.e., underneath the spring thin-ice punctuated with melting ponds. The potential role of NPQs in the photophysiological plasticity of T. gravida is discussed.

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How to cite 

Lacour Thomas, Lariviere Jade, Ferland Joannie, Bruyant Flavienne, Lavaud Johann, Babin Marcel (2018). The Role of Sustained Photoprotective Non-photochemical Quenching in Low Temperature and High Light Acclimation in the Bloom-Forming Arctic Diatom Thalassiosira gravida. Frontiers In Marine Science, 5(354), 16p. Publisher's official version : https://doi.org/10.3389/fmars.2018.00354 , Open Access version : https://archimer.ifremer.fr/doc/00462/57387/