FN Archimer Export Format
PT J
TI The Role of Sustained Photoprotective Non-photochemical Quenching in Low Temperature and High Light Acclimation in the Bloom-Forming Arctic Diatom Thalassiosira gravida
BT 
AF LACOUR, Thomas
   LARIVIERE, Jade
   FERLAND, Joannie
   BRUYANT, Flavienne
   LAVAUD, Johann
   BABIN, Marcel
AS 1:1;2:;3:;4:;5:;6:;
FF 1:;2:;3:;4:;5:;6:;
C1 Univ Laval, Takuvik Joint Int Lab, CNRS, Pavillon Alexandre Vachon, Quebec City, PQ, Canada.
C2 UNIV LAVAL, CANADA
IN DOAJ
IF 5.247
TC 33
UR https://archimer.ifremer.fr/doc/00462/57387/59468.pdf
   https://archimer.ifremer.fr/doc/00462/57387/59469.pdf
LA English
DT Article
DE ;Arctic diatom;photosynthesis;sustained NPQ;irradiance;temperature
AB 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. 
PY 2018
PD OCT
SO Frontiers In Marine Science
SN 2296-7745
PU Frontiers Media Sa
VL 5
IS 354
UT 000457521300001
DI 10.3389/fmars.2018.00354
ID 57387
ER

EF