Data/hora: 07/06/2024 02:37:29

Provedor de dados: | 5
País: | France
Título: | The Role of Sustained Photoprotective Non-photochemical Quenching in Low Temperature and High Light Acclimation in the Bloom-Forming Arctic Diatom Thalassiosira gravida
Autores: | Lacour, Thomas; Lariviere, Jade; Ferland, Joannie; Bruyant, Flavienne; Lavaud, Johann; Babin, Marcel.
Data: | 2018-10
Ano: | 2018
Palavras-chave: | Arctic diatom; Photosynthesis; Sustained NPQ; Irradiance; Temperature.
Resumo: | 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.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/00462/57387/59468.pdf

https://archimer.ifremer.fr/doc/00462/57387/59469.pdf

DOI:10.3389/fmars.2018.00354

https://archimer.ifremer.fr/doc/00462/57387/

Editor: | Frontiers Media Sa
Formato: | application/pdf
Fonte: | Frontiers In Marine Science (2296-7745) (Frontiers Media Sa), 2018-10 , Vol. 5 , N. 354 , P. 16p.

Fonte:

info:eu-repo/semantics/openAccess

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