Abstract
Desiccation-tolerance ability in photosynthetic organisms is largely based on a battery of photoprotective mechanisms. Xanthophyll cycle operation induced by desiccation in the absence of light has been previously proven in the desiccation-tolerant fern Ceterach officinarum. To understand the physiological function of xanthophyll cycle induction in darkness and its implication in the desiccation tolerance in more detail, we studied its triggering factors and its photochemical effects in the lichen Lobaria pulmonaria. We found that both the drying rate and the degree of desiccation play a crucial role in the violaxanthin de-epoxidase activation. De-epoxidation of violaxanthin to zeaxanthin (Z) occurs when the tissue has lost most of its water and only after slow dehydration, suggesting that a minimum period of time is required for the enzyme activity induction. Fluorescence analysis showed that Z, synthesised during tissue dehydration in the absence of light, prevents photoinhibition when rewatered tissues are illuminated. This is probably due to Z implication in both non-photochemical quenching and/or antioxidative responses.
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Abbreviations
- A:
-
Antheraxanthin
- Chl:
-
Chlorophyll
- Dh:
-
Dehydrated
- DTT:
-
Dithiothreitol
- F 0 :
-
Minimum chlorophyll fluorescence yield
- F m :
-
Maximum chlorophyll fluorescence yield
- F v :
-
Variable chlorophyll fluorescence
- Fv/Fm:
-
Maximum quantum yield of the PS II
- H:
-
Hydrated
- NPQ:
-
Non-photochemical quenching
- PFD:
-
Photon flux density
- R:
-
Rehydrated
- RH:
-
Relative humidity
- ROS:
-
Reactive oxygen species
- RWC:
-
Relative water content
- VAZ:
-
Violaxanthin–antheraxanthin–zeaxanthin
- VDE:
-
Violaxanthin de-epoxidase
- V:
-
Violaxanthin
- Z:
-
Zeaxanthin
- ZE:
-
Zeaxanthin epoxidase
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Acknowledgments
We are very grateful to Jane Edwards for linguistic consultation of the manuscript. B.F.M. received a fellowship from the Basque Government. This research was supported by research BFU 2007-62637 from the Ministry of Education and Science of Spain and research project UPV/EHU-GV IT-299-07.
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Fernández-Marín, B., Becerril, J.M. & García-Plazaola, J.I. Unravelling the roles of desiccation-induced xanthophyll cycle activity in darkness: a case study in Lobaria pulmonaria . Planta 231, 1335–1342 (2010). https://doi.org/10.1007/s00425-010-1129-6
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DOI: https://doi.org/10.1007/s00425-010-1129-6