Article (Scientific journals)
Different levels of energetic coupling between photosynthesis and respiration do not determine the occurrence of adaptive responses of Symbiodiniaceae to global warming
Pierangelini, Mattia; Thiry, Marc; Cardol, Pierre
2020In New Phytologist
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Keywords :
climate change; adaptation; coral reefs
Abstract :
[en] Disentangling the metabolic functioning of corals' endosymbionts (Symbiodiniaceae) is relevant to understanding the response of coral reefs to warming oceans. In this work, we first question whether there is an energetic coupling between photosynthesis and respiration in Symbiodiniaceae (Symbiodinium, Durusdinium and Effrenium), and second, how different levels of energetic coupling will affect their adaptive responses to global warming. Coupling between photosynthesis and respiration was established by determining the variation of metabolic rates during thermal response curves, and how inhibition of respiration affects photosynthesis. Adaptive (irreversible) responses were studied by exposing two Symbiodinium species with different levels of photosynthesis–respiration interaction to high temperature conditions (32°C) for 1 yr. We found that some Symbiodiniaceae have a high level of energetic coupling; that is, photosynthesis and respiration have the same temperature dependency, and photosynthesis is negatively affected when respiration is inhibited. Conversely, photosynthesis and respiration are not coupled in other species. In any case, prolonged exposure to high temperature caused adjustments in both photosynthesis and respiration, but these changes were fully reversible. We conclude that energetic coupling between photosynthesis and respiration exhibits wide variation amongst Symbiodiniaceae and does not determine the occurrence of adaptive responses in Symbiodiniaceae to temperature increase.
Disciplines :
Environmental sciences & ecology
Aquatic sciences & oceanology
Phytobiology (plant sciences, forestry, mycology...)
Author, co-author :
Pierangelini, Mattia ;  Université de Liège - ULiège > Département des sciences de la vie > Génétique et physiologie des microalgues
Thiry, Marc  ;  Université de Liège - ULiège > Département des sciences de la vie > Biologie cellulaire
Cardol, Pierre  ;  Université de Liège - ULiège > Département des sciences de la vie > Génétique et physiologie des microalgues
Language :
English
Title :
Different levels of energetic coupling between photosynthesis and respiration do not determine the occurrence of adaptive responses of Symbiodiniaceae to global warming
Publication date :
2020
Journal title :
New Phytologist
ISSN :
0028-646X
eISSN :
1469-8137
Publisher :
Wiley, Oxford, United Kingdom
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 09 January 2021

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