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Singular physiological behavior of the scleractinian coral Porites astreoides in the dark phase
Coral Reefs ( IF 2.7 ) Pub Date : 2020-12-17 , DOI: 10.1007/s00338-020-02023-4 Pascal Claquin , Malika Rene-Trouillefou , Pascal Jean Lopez , Aurélien Japaud , Yolande Bouchon-Navaro , Sébastien Cordonnier , Claude Bouchon
Coral Reefs ( IF 2.7 ) Pub Date : 2020-12-17 , DOI: 10.1007/s00338-020-02023-4 Pascal Claquin , Malika Rene-Trouillefou , Pascal Jean Lopez , Aurélien Japaud , Yolande Bouchon-Navaro , Sébastien Cordonnier , Claude Bouchon
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 ( F v / F m ) in the dark and the effective photochemical efficiency ( F q′ / F m′ ) 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 F v / F m (ΔYII max ) was calculated after 3 min or 2 h of dark acclimation (ΔYII max(2 h) ; ΔYII max(3 min) ). The three 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 F v / F m (ΔYII max(2 h) = 47.79%) was observed in P. astreoides in the dark whereas the average ΔYII max(2 h) of the other species tested was 0.677%. The decrease in ΔYII max in P. astreoides was due to a significant increase in F o (Δ F o(2 h) = − 108.64% ± SD 21.48) whereas F m remained relatively stable. The increase in F o 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.
更新日期：2020-12-17
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