Singular physiological behavior of the scleractinian coral Porites astreoides in the dark phase
- PDF / 986,881 Bytes
- 12 Pages / 595.276 x 790.866 pts Page_size
- 29 Downloads / 163 Views
REPORT
Singular physiological behavior of the scleractinian coral Porites astreoides in the dark phase Pascal Claquin1,2 • Malika Rene-Trouillefou1,3 • Pascal Jean Lopez1 • Aure´lien Japaud1,3 • Yolande Bouchon-Navaro1,3 • Se´bastien Cordonnier1,3 Claude Bouchon1,3
•
Received: 17 March 2020 / Accepted: 24 October 2020 Ó Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Unlike most other corals that have been declining since the 1980s, the population of Porites astreoides, one of the dominant species of coral in Caribbean reefs, appears to be resilient. We investigated the physiological regulation of the electron transport chain of Symbiodiniaceae chloroplasts during the light/dark transition in P. astreoides compared to nine other common scleractinian corals. Protocols were applied to coral samples in seawater tanks and in situ. The maximum quantum yield (Fv/Fm) in the dark and the effective photochemical efficiency (Fq0 / Fm0 ) in the light were measured during light–dark transitions, and alternative electron flow mechanisms were evaluated using fluorescence variation in response to serial irradiation pulses (SIP protocol). The variation in Fv/Fm (DYIImax) was calculated after 3 min or 2 h of dark acclimation (DYIImax(2 h); DYIImax(3 min)). The three
Topic Editor Simon Davy
species that belong to the genus Porites (P. astreoides, P. divaricata, P. furcata) showed plastoquinone reduction (PQ) in response to the SIP protocol, unlike all the other species tested. A marked decrease in Fv/Fm (DYIImax(2 h)= 47.79%) was observed in P. astreoides in the dark whereas the average DYIImax(2 h) of the other species tested was 0.677%. The decrease in DYIImax in P. astreoides was due to a significant increase in Fo (DFo(2 h)= - 108.64% ± SD 21.48) whereas Fm remained relatively stable. The increase in Fo was attributed to reduction of the PQ pool through a chlororespiration-like mechanism known to reduce the production of reactive oxygen species. This mechanism was triggered immediately after exposure to the dark, while a brief and moderate light exposure reversed it. Given the ecological success of P. astreoides, we suggest that the high antioxidant capability of this species in the dark phase could be one of the factors favoring its survival in the face of various environmental and anthropogenic threats.
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00338-020-02023-4) contains supplementary material, which is available to authorized users.
Keywords Chlororespiration-like PAM Caribbean reef corals Resilience
& Pascal Claquin [email protected] 1
Laboratoire de Biologie des ORganismes et Ecosyste`mes Aquatiques (BOREA), FRE 2030, Muse´um National d’Histoire Naturelle, CNRS, IRD, Sorbonne Universite´, Universite´ de Caen Normandie, Universite´ des Antilles, CP 26, 43 rue Cuvier, 75005 Paris, France
2
Centre de Recherches en Environnement Coˆtier (CREC) Station Marine, Universite´ de Caen Normandie, Normandie Universite´, BP 49, 54, rue du
Data Loading...
