Vol 4: Increasing pCO2 correlates with low concentrations of intracellular dimethylsulfoniopropionate in the sea anemone Anemonia viridis.Report as inadecuate



 Vol 4: Increasing pCO2 correlates with low concentrations of intracellular dimethylsulfoniopropionate in the sea anemone Anemonia viridis.


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This article is from Ecology and Evolution, volume 4.AbstractMarine anthozoans maintain a mutualistic symbiosis with dinoflagellates that are prolific producers of the algal secondary metabolite dimethylsulfoniopropionate DMSP, the precursor of the climate-cooling trace gas dimethyl sulfide DMS. Surprisingly, little is known about the physiological role of DMSP in anthozoans and the environmental factors that regulate its production. Here, we assessed the potential functional role of DMSP as an antioxidant and determined how future increases in seawater pCO2 may affect DMSP concentrations in the anemone Anemonia viridis along a natural pCO2 gradient at the island of Vulcano, Italy. There was no significant difference in zooxanthellae genotype and characteristics density of zooxanthellae, and chlorophyll a as well as protein concentrations between anemones from three stations along the gradient, V1 3232 μatm CO2, V2 682 μatm and control 463 μatm, which indicated that A. viridis can acclimate to various seawater pCO2. In contrast, DMSP concentrations in anemones from stations V1 33.23 ± 8.30 fmol cell−1 and V2 34.78 ± 8.69 fmol cell−1 were about 35% lower than concentrations in tentacles from the control station 51.85 ± 12.96 fmol cell−1. Furthermore, low tissue concentrations of DMSP coincided with low activities of the antioxidant enzyme superoxide dismutase SOD. Superoxide dismutase activity for both host 7.84 ± 1.37 U·mg−1 protein and zooxanthellae 2.84 ± 0.41 U·mg−1 protein at V1 was 40% lower than at the control station host: 13.19 ± 1.42; zooxanthellae: 4.72 ± 0.57 U·mg−1 protein. Our results provide insight into coastal DMSP production under predicted environmental change and support the function of DMSP as an antioxidant in symbiotic anthozoans.



Author: Borell, Esther M; Steinke, Michael; Horwitz, Rael; Fine, Maoz

Source: https://archive.org/







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