Induction of photosynthesis under anoxic ...
Type de document :
Article dans une revue scientifique: Article original
URL permanente :
Titre :
Induction of photosynthesis under anoxic condition in Thalassiosira pseudonana and Euglena gracilis: interactions between fermentation and photosynthesis
Auteur(s) :
Gain, Gwenaëlle [Auteur]
Integrative Biological Sciences [InBioS]
Berne, Nicolas [Auteur]
Integrative Biological Sciences [InBioS]
Feller, Tom [Auteur]
Integrative Biological Sciences [InBioS]
Godaux, Damien [Auteur]
Integrative Biological Sciences [InBioS]
Cenci, Ugo [Auteur]
Unité de Glycobiologie Structurale et Fonctionnelle - UMR 8576 [UGSF]
Cardol, Pierre [Auteur]
Integrative Biological Sciences [InBioS]
Integrative Biological Sciences [InBioS]
Berne, Nicolas [Auteur]
Integrative Biological Sciences [InBioS]
Feller, Tom [Auteur]
Integrative Biological Sciences [InBioS]
Godaux, Damien [Auteur]
Integrative Biological Sciences [InBioS]
Cenci, Ugo [Auteur]
Unité de Glycobiologie Structurale et Fonctionnelle - UMR 8576 [UGSF]
Cardol, Pierre [Auteur]
Integrative Biological Sciences [InBioS]
Titre de la revue :
Frontiers in Plant Science
Nom court de la revue :
Front. Plant Sci.
Numéro :
14
Éditeur :
Frontiers Media SA
Date de publication :
2023-07-25
ISSN :
1664-462X
Mot(s)-clé(s) en anglais :
Euglena gracilis
Thalassiosira pseudonana
fermentation
photosynthesis
hydrogenase
cyclic electron flow (CEF)
Thalassiosira pseudonana
fermentation
photosynthesis
hydrogenase
cyclic electron flow (CEF)
Discipline(s) HAL :
Sciences du Vivant [q-bio]
Chimie/Chimie théorique et/ou physique
Chimie/Chimie théorique et/ou physique
Résumé en anglais : [en]
Introduction : In their natural environment, microalgae can be transiently exposed to hypoxic or anoxic environments. Whereas fermentative pathways and their interactions with photosynthesis are relatively well characterized ...
Lire la suite >Introduction : In their natural environment, microalgae can be transiently exposed to hypoxic or anoxic environments. Whereas fermentative pathways and their interactions with photosynthesis are relatively well characterized in the green alga model Chlamydomonas reinhardtii, little information is available in other groups of photosynthetic micro-eukaryotes. In C. reinhardtii cyclic electron flow (CEF) around photosystem (PS) I, and light-dependent oxygen-sensitive hydrogenase activity both contribute to restoring photosynthetic linear electron flow (LEF) in anoxic conditions.Methods : Here we analyzed photosynthetic electron transfer after incubation in dark anoxic conditions (up to 24 h) in two secondary microalgae: the marine diatom Thalassiosira pseudonana and the excavate Euglena gracilis.Results : Both species showed sustained abilities to prevent over-reduction of photosynthetic electron carriers and to restore LEF. A high and transient CEF around PSI was also observed specifically in anoxic conditions at light onset in both species. In contrast, at variance with C. reinhardtii, no sustained hydrogenase activity was detected in anoxic conditions in both species.Discussion : Altogether our results suggest that another fermentative pathway might contribute, along with CEF around PSI, to restore photosynthetic activity in anoxic conditions in E. gracilis and T. pseudonana. We discuss the possible implication of the dissimilatory nitrate reduction to ammonium (DNRA) in T. pseudonana and the wax ester fermentation in E. gracilis.Lire moins >
Lire la suite >Introduction : In their natural environment, microalgae can be transiently exposed to hypoxic or anoxic environments. Whereas fermentative pathways and their interactions with photosynthesis are relatively well characterized in the green alga model Chlamydomonas reinhardtii, little information is available in other groups of photosynthetic micro-eukaryotes. In C. reinhardtii cyclic electron flow (CEF) around photosystem (PS) I, and light-dependent oxygen-sensitive hydrogenase activity both contribute to restoring photosynthetic linear electron flow (LEF) in anoxic conditions.Methods : Here we analyzed photosynthetic electron transfer after incubation in dark anoxic conditions (up to 24 h) in two secondary microalgae: the marine diatom Thalassiosira pseudonana and the excavate Euglena gracilis.Results : Both species showed sustained abilities to prevent over-reduction of photosynthetic electron carriers and to restore LEF. A high and transient CEF around PSI was also observed specifically in anoxic conditions at light onset in both species. In contrast, at variance with C. reinhardtii, no sustained hydrogenase activity was detected in anoxic conditions in both species.Discussion : Altogether our results suggest that another fermentative pathway might contribute, along with CEF around PSI, to restore photosynthetic activity in anoxic conditions in E. gracilis and T. pseudonana. We discuss the possible implication of the dissimilatory nitrate reduction to ammonium (DNRA) in T. pseudonana and the wax ester fermentation in E. gracilis.Lire moins >
Langue :
Anglais
Comité de lecture :
Oui
Audience :
Internationale
Vulgarisation :
Non
Projet Européen :
Établissement(s) :
Université de Lille
CNRS
CNRS
Équipe(s) de recherche :
Génétique microbienne
Date de dépôt :
2023-09-26T13:54:31Z
2023-09-28T12:51:57Z
2023-09-28T12:51:57Z
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