| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
The Role of Sustained Photoprotective Non-photochemical Quenching in Low Temperature and High Light Acclimation in the Bloom-Forming Arctic Diatom Thalassiosira gravida
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| Autores: |
Lacour, Thomas
Lariviere, Jade
Ferland, Joannie
Bruyant, Flavienne
Lavaud, Johann
Babin, Marcel
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| Data: |
2018-10
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| Ano: |
2018
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| Palavras-chave: |
Arctic diatom
Photosynthesis
Sustained NPQ
Irradiance
Temperature
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| 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.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| 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/
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| Editor: |
Frontiers Media Sa
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| Formato: |
application/pdf
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| Fonte: |
Frontiers In Marine Science (2296-7745) (Frontiers Media Sa), 2018-10 , Vol. 5 , N. 354 , P. 16p.
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| Direitos: |
info:eu-repo/semantics/openAccess
restricted use
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