High levels of floridoside at high salinity link osmoadaptation with bleaching susceptibility in the cnidarian-algal endosymbiosis

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2019
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Gegner, Hagen M.
Ochsenkühn, Michael
Barreto, Marcelle M.
Ziegler, Maren
Reichert, Jessica
Schubert, Patrick
Wilke, Thomas
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Biology Open. 2019, 8(12), bio045591. eISSN 2046-6390. Available under: doi: 10.1242/bio.045591
Zusammenfassung

Coral reefs are in global decline mainly due to increasing sea surface temperatures triggering coral bleaching. Recently, high salinity has been linked to increased thermotolerance and decreased bleaching in the sea anemone coral model Aiptasia. However, the underlying processes remain elusive. Using two Aiptasia host­–endosymbiont pairings, we induced bleaching at different salinities and show reduced reactive oxygen species (ROS) release at high salinities, suggesting a role of osmoadaptation in increased thermotolerance. A subsequent screening of osmolytes revealed that this effect was only observed in algal endosymbionts that produce 2-O-glycerol-α-D-galactopyranoside (floridoside), an osmolyte capable of scavenging ROS. This result argues for a mechanistic link between osmoadaptation and thermotolerance, mediated by ROS-scavenging osmolytes (e.g., floridoside). This sheds new light on the putative mechanisms underlying the remarkable thermotolerance of corals from water bodies with high salinity such as the Red Sea or Persian/Arabian Gulf and holds implications for coral thermotolerance under climate change.

Zusammenfassung in einer weiteren Sprache
Fachgebiet (DDC)
570 Biowissenschaften, Biologie
Schlagwörter
Coral reefs, Coral bleaching, Aiptasia, Climate change, Symbiosis, Symbiodiniaceae
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ISO 690GEGNER, Hagen M., Nils RÄDECKER, Michael OCHSENKÜHN, Marcelle M. BARRETO, Maren ZIEGLER, Jessica REICHERT, Patrick SCHUBERT, Thomas WILKE, Christian R. VOOLSTRA, 2019. High levels of floridoside at high salinity link osmoadaptation with bleaching susceptibility in the cnidarian-algal endosymbiosis. In: Biology Open. 2019, 8(12), bio045591. eISSN 2046-6390. Available under: doi: 10.1242/bio.045591
BibTex
@article{Gegner2019-12-16level-48079,
  year={2019},
  doi={10.1242/bio.045591},
  title={High levels of floridoside at high salinity link osmoadaptation with bleaching susceptibility in the cnidarian-algal endosymbiosis},
  number={12},
  volume={8},
  journal={Biology Open},
  author={Gegner, Hagen M. and Rädecker, Nils and Ochsenkühn, Michael and Barreto, Marcelle M. and Ziegler, Maren and Reichert, Jessica and Schubert, Patrick and Wilke, Thomas and Voolstra, Christian R.},
  note={Article Number: bio045591}
}
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