Abstract
Lichens as symbiotic associations consisting of a fungus (the mycobiont) and a photosynthetic partner (the photobiont) dominate the terrestrial vegetation of continental Antarctica. The photobiont provides carbon nutrition for the fungus. Therefore, performance and protection of photosystem II is a key factor of lichen survival. Potentials and limitations of photobiont physiology require intense investigation to extend the knowledge on adaptation mechanisms in the lichen symbiosis and to clarify to which extent photobionts benefit from symbiosis. Isolated photobionts and entire lichen thalli have been examined. The contribution of the photobiont concerning adaptation mechanisms to the light regime and temperature conditions was examined by chlorophyll a fluorescence and pigment analysis focusing on the foliose lichen Umbilicaria decussata from North Victoria Land, continental Antarctica. No photoinhibition has been observed in the entire lichen thallus. In the isolated photobionts, photoinhibition was clearly temperature dependent. For the first time, melanin in U. decussata thalli has been proved. Though the isolated photobiont is capable of excess light protection, the results clearly show that photoprotection is significantly increased in the symbiotic state. The closely related photobiont of Pleopsidium chlorophanum, a lichen lacking melanin, showed a higher potential of carotenoid-based excess light tolerance. This fact discriminates the two photobionts of the same Trebouxia clade. Based on the results, it can be concluded that the successful adaptation of lichens to continental Antarctic conditions is in part based on the physiological potential of the photobionts. The findings provide information on the success of symbiotic life in extreme environments.
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Abbreviations
- ANOVA:
-
Analysis of variance
- chl f :
-
Chlorophyll fluorescence
- DEPS:
-
De-epoxidation state of the xanthophyll pool
- DMSO:
-
Dimethyl sulfoxide
- GANOVEX:
-
German Antarctic North Victoria Land Expedition
- HPLC:
-
High-performance liquid chromatography
- MY:
-
Malt–yeast
- NPQ:
-
Non-photochemical quenching
- PAM:
-
Pulse-amplitude modulation
- PAR:
-
Photosynthetically active radiation
- PPFD:
-
Photosynthetically active photon flux density
- PS:
-
Photosystem
- ROS:
-
Reactive oxygen species
- SLC:
-
Secondary lichen compound
- TOM:
-
Trebouxia organic medium
- UVR:
-
Ultraviolet radiation
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Acknowledgments
Special thanks to Eva Posthoff for her substantial help with the photobiont cultures. Thanks are also due to the organization committee of the XIth SCAR Biology Symposium 2013, Barcelona. The first author thanks the Studienstiftung des Deutschen Volkes for financial support. The second author is grateful to the German Research Foundation (DFG) for financing the research project Ot 96/15–1 as part of the Antarctic Priority Program (SPP 1158). Special thanks are due to the BGR (Bundesanstalt für Geologie und Rohstoffe), Andreas Läufer and Detlef Damaske for inviting the second author to the expedition GANOVEX X and logistic support. The staff of the Gondwana Station is thanked for their invaluable help. The results are included in the doctoral thesis of Andres Sadowsky. Thanks are also due to the anonymous reviewers for their helpful comments.
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This article is an invited contribution on Life in Antarctica: Boundaries and Gradients in a Changing Environment as the main theme of the XIth SCAR Biology Symposium.
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Sadowsky, A., Ott, S. Symbiosis as a successful strategy in continental Antarctica: performance and protection of Trebouxia photosystem II in relation to lichen pigmentation. Polar Biol 39, 139–151 (2016). https://doi.org/10.1007/s00300-015-1677-0
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DOI: https://doi.org/10.1007/s00300-015-1677-0