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Stimulated Respiration and Net Photosynthesis in Cassiopeia sp. during Glucose Enrichment Suggests in hospite CO<sub>2</sub> Limitation of Algal Endosymbionts

Stimulated Respiration and Net Photosynthesis in Cassiopeia sp. during Glucose Enrichment Suggests in hospite CO2 Limitation of Algal Endosymbionts

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RÄDECKER, Nils, Claudia POGOREUTZ, Christian WILD, Christian R. VOOLSTRA, 2017. Stimulated Respiration and Net Photosynthesis in Cassiopeia sp. during Glucose Enrichment Suggests in hospite CO2 Limitation of Algal Endosymbionts. In: Frontiers in Marine Science. Frontiers. 4, 267. eISSN 2296-7745. Available under: doi: 10.3389/fmars.2017.00267

@article{Radecker2017-08-15Stimu-50728, title={Stimulated Respiration and Net Photosynthesis in Cassiopeia sp. during Glucose Enrichment Suggests in hospite CO2 Limitation of Algal Endosymbionts}, year={2017}, doi={10.3389/fmars.2017.00267}, volume={4}, journal={Frontiers in Marine Science}, author={Rädecker, Nils and Pogoreutz, Claudia and Wild, Christian and Voolstra, Christian R.}, note={Article Number: 267} }

eng Voolstra, Christian R. Attribution 4.0 International Pogoreutz, Claudia The endosymbiosis between cnidarians and dinoflagellates of the genus Symbiodinium is key to the high productivity of tropical coral reefs. In this endosymbiosis, Symbiodinium translocate most of their photosynthates to their animal host in exchange for inorganic nutrients. Among these, carbon dioxide (CO<sub>2</sub>) derived from host respiration helps to meet the carbon requirements to sustain photosynthesis of the dinoflagellates. Nonetheless, recent studies suggest that productivity in symbiotic cnidarians such as corals is CO<sub>2</sub>-limited. Here we show that glucose enrichment stimulates respiration and gross photosynthesis rates by 80 and 140%, respectively, in the symbiotic upside-down jellyfish Cassiopeia sp. from the Central Red Sea. Our findings show that glucose was rapidly consumed and respired within the Cassiopeia sp. holobiont. The resulting increase of CO<sub>2</sub> availability in hospite in turn likely stimulated photosynthesis in Symbiodinium. Hence, the increase of photosynthesis under these conditions suggests that CO<sub>2</sub> limitation of Symbiodinium is a common feature of stable cnidarian holobionts and that the stimulation of holobiont metabolism may attenuate this CO<sub>2</sub> limitation. Wild, Christian Voolstra, Christian R. Rädecker, Nils Pogoreutz, Claudia 2020-09-08T12:37:55Z 2017-08-15 Stimulated Respiration and Net Photosynthesis in Cassiopeia sp. during Glucose Enrichment Suggests in hospite CO<sub>2</sub> Limitation of Algal Endosymbionts Rädecker, Nils 2020-09-08T12:37:55Z Wild, Christian

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