Article (Scientific journals)
Differential antioxidant response between two Symbiodinium species from contrasting environments
Roberty, Stéphane; Furla, Paola; Plumier, Jean-Christophe
2016In Plant, Cell and Environment
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Keywords :
coral bleaching; ubiquitin; symbiosis; reactive oxygen species; oxidative stress; diatoxanthin; pigments; menadione sodium bisulfite
Abstract :
[en] High sea surface temperature accompanied by high levels of solar irradiance is responsible for the disruption of the symbiosis between cnidarians and their symbiotic dinoflagellates from the genus Symbiodinium. This phenomenon, known as coral bleaching, is one of the major threats affecting coral reefs around the world. Because an important molecular trigger to bleaching appears related to the production of reactive oxygen species (ROS), it is critical to understand the function of the antioxidant network of Symbiodinium species. In this study we investigated the response of two Symbiodinium species, from contrasting environments, to a chemically induced oxidative stress. ROS produced during this oxidative burst reduced photosynthesis by 30 to 50% and significantly decreased the activity of superoxide dismutase. Lipid peroxidation levels and carotenoid concentrations, especially diatoxanthin, confirm that these molecules act as antioxidants and contribute to the stabilization of membrane lipids. The comparative analysis between the two Symbiodinium species allowed us to highlight that Symbiodinium sp. clade A temperate was more tolerant to oxidative stress than the tropical S. kawagutii clade F. These differences are very likely a consequence of adaptation to their natural environment, with the temperate species experiencing conditions of temperature and irradiance much more variable and extreme.
Disciplines :
Aquatic sciences & oceanology
Author, co-author :
Roberty, Stéphane  ;  Université de Liège > Département de Biologie, Ecologie et Evolution > Ecophysiologie et physiologie animale
Furla, Paola
Plumier, Jean-Christophe ;  Université de Liège > Département de Biologie, Ecologie et Evolution > Ecophysiologie et physiologie animale
Language :
English
Title :
Differential antioxidant response between two Symbiodinium species from contrasting environments
Publication date :
2016
Journal title :
Plant, Cell and Environment
ISSN :
0140-7791
eISSN :
1365-3040
Publisher :
Blackwell Publishing, New York, United States - New York
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 14 October 2016

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