Data/hora: 11/06/2024 19:12:57

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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