Abstract
The mechanisms involved in desiccation tolerance of lichens and their photobionts are still poorly understood. To better understand these mechanisms we have studied dehydration rate and desiccation time in Trebouxia, the most abundant chlorophytic photobiont in lichen. Our findings indicate that the drying rate has a profound effect on the recovery of photosynthetic activity of algae after rehydration, greater than the effects of desiccation duration. The basal fluorescence (F′o) values in desiccated algae were significantly higher after rapid dehydration, than after slow dehydration, suggesting higher levels of light energy dissipation in slow-dried algae. Higher values of PSII electron transport were recovered after rehydration of slow-dried Trebouxia erici compared to rapid-dried algae. The main component of non-photochemical quenching after slow dehydration was energy dependent (q E), whereas after fast dehydration it was photoinhibition (q I). Although q E seems to play a role during desiccation recovery, no significant variations were detected in the xanthophyll cycle components. Desiccation did not affect PSI functionality. Classical antioxidant activities like superoxide dismutase or peroxidase decreased during desiccation and early recovery. Dehydrins were detected in the lichen-forming algae T. erici and were constitutively expressed. There is probably a minimal period required to develop strategies which will facilitate transition to the desiccated state in this algae. In this process, the xanthophyll cycle and classical antioxidant mechanisms play a very limited role, if any. However, our results indicate that there is an alternative mechanism of light energy dissipation during desiccation, where activation is dependent on a sufficiently slow dehydration rate.
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Abbreviations
- F o :
-
Minimal fluorescence intensity in dark-adapted samples
- F m :
-
Maximal fluorescence intensity in dark-adapted samples
- F v :
-
Variable fluorescence (F v = F m − F o)
- FV/Fm:
-
Maximal quantum yield of PSII photochemistry
- F′m:
-
Maximum fluorescence intensity in illuminated samples
- F′o:
-
Minimum fluorescence intensity in illuminated samples state
- F s :
-
Fluorescence intensity during exposure to light
- F′v/F′m:
-
Maximum quantum yield of PSII in light-adapted samples
- ϕPSII :
-
Quantum yield of PSII during exposure to light
- q P :
-
Photochemical quenching
- q N :
-
Non-photochemical quenching
- q E :
-
Energy-dependent quenching
- q I :
-
Photoinhibitory quenching
- q M :
-
Middle phase of dark relaxation quenching
- A:
-
Antheraxantin
- DPS:
-
De-epoxidation state of the xanthophyll cycle
- PAR:
-
Photosynthetically active radiation
- P700:
-
Reaction centre of the PSI
- PSI, PSII:
-
Photosystem I (II)
- POX:
-
Peroxidase
- RD:
-
Rapid dehydration
- RWC:
-
Relative water content
- SD:
-
Slow dehydration
- SOD:
-
Superoxide dismutase
- V:
-
Violaxanthin
- Z:
-
Zeaxanthin
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An erratum to this article can be found at http://dx.doi.org/10.1007/s00425-009-1030-3
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Gasulla, F., de Nova, P.G., Esteban-Carrasco, A. et al. Dehydration rate and time of desiccation affect recovery of the lichenic algae Trebouxia erici: alternative and classical protective mechanisms. Planta 231, 195–208 (2009). https://doi.org/10.1007/s00425-009-1019-y
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DOI: https://doi.org/10.1007/s00425-009-1019-y