Abstract
Coral photosynthetic endosymbionts (Symbiodinium) are phylogenetically very diverse, yet the extent of inter- and intraspecific functional variation within clades remains largely underexplored. Understanding this variability will be critical for future research on climate change mediated responses. A properly functioning thylakoid membrane is essential for optimal photosynthetic performance both in free living and in hospite conditions. Here, we analyse the thylakoid membrane melting points of 13 Symbiodinium strains from species in Clades B and A, grown at both control (26 °C) and high temperature (31 °C). We observed a broad range of responses to thermal stress regardless of taxonomic rank. Our results support and augment a growing body of the literature demonstrating that functional differences among Symbiodinium spp. are as distinct at lower taxonomic levels (i.e. interspecific) as they are among major clades. These findings highlight the importance of assessing the variability of plastid traits across the Symbiodinium tree.
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Acknowledgements
We thank Todd C. LaJeunesse for providing input throughout the project as well as the Symbiodinium phylogeny. We thank Allison M. Lewis for preparing and sharing The LaJeunesse lab Symbiodinium cultures. We also thank the members of the Medina and Iglesias-Prieto labs for their support during the experiments and for input on the manuscript, as well as David Suggett and reviewers for reviewing and for providing comments that improved the manuscript. This document was written in partial fulfilment of Joost Mansour’s masters thesis at the University of Amsterdam. This work was supported by NSF Grants OCE 1442206 and OCE 1642311.
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ESM Fig. 1
Temperature-dependent melting curves of photosynthetic membranes for tested Symbiodinium strains. 8.33*104 cells ml−1 in 100 μl samples were incubated in a thermal cycler for five minutes at increasing temperatures. Photochemical efficiency (Fv/Fm) was measured after the five minutes of incubation at each temperature. Fluorescence parameters of PSII are plotted as relative to respective maximum. For each strain is depicted: Fv/Fm (dots); 4 parameter sigmoidal curve fit (line); 95% confidence limits of the 4p sigmoidal curve fit (dotted lines). In red are represented cultures with a high temperature treatment of 1.5 days at 31 °C, in blue cultures kept at 26 °C. Data was collected from three replicate experiments per temperature, using the same culture. (EPS 20694 kb)
ESM Fig. 2
Temperature-dependent melting curves of photosynthetic membranes for tested Symbiodinium species. Per species is depicted the mean Fv/Fm (dots) of data from all respective strains per replicate experiment; four-parameter sigmoidal curve fit (line); 95% confidence limits of the 4p sigmoidal curve fit (dotted lines). In red are represented cultures with a high temperature treatment of 1.5 days at 31 °C, in blue cultures kept at 26 °C. Data was collected from three replicate experiments per temperature, using the same culture. (EPS 5668 kb)
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Mansour, J.S., Pollock, F.J., Díaz-Almeyda, E. et al. Intra- and interspecific variation and phenotypic plasticity in thylakoid membrane properties across two Symbiodinium clades. Coral Reefs 37, 841–850 (2018). https://doi.org/10.1007/s00338-018-1710-1
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DOI: https://doi.org/10.1007/s00338-018-1710-1