Does Parmelina tiliacea lichen photosystem II survive at liquid nitrogen temperatures?
- Oukarroum A Mohammed VI Polytechnic University, School of Agriculture, Fertilizing and Environment, Ben Guerir, Morocco; Bioenergetics and Microbiology Laboratory, University of Geneva, CH-1254 Jussy-Geneva, Switzerland. Electronic address: oukarroum.abdallah@uqam.ca.
- El Gharous M Mohammed VI Polytechnic University, School of Agriculture, Fertilizing and Environment, Ben Guerir, Morocco.
- Strasser RJ Bioenergetics and Microbiology Laboratory, University of Geneva, CH-1254 Jussy-Geneva, Switzerland.
- 2016-12-19
Published in:
- Cryobiology. - 2017
Chlorophyll a fluorescence rise
Dry and wet state
Liquid nitrogen
Parmelina tiliacea
Chlorophyll
Chlorophyll A
Cold Temperature
Nitrogen
Parmeliaceae
Photochemistry
Photosynthesis
Photosystem II Protein Complex
English
Parmelina tiliacea lichens kept in the wet and dry state were stored in liquid nitrogen for 1 week and the subsequent recovery of their photosynthetic apparatus was followed. The chlorophyll a fluorescence rise and the maximum quantum yield of primary photochemistry φPo (FV/FM) were analysed for this purpose. Storage of wet thalli for 1 week in liquid nitrogen led to an impairment of photosystem II and probably the photosynthetic apparatus as a whole, from which the thalli did not recover over time. Thalli exposed in the dry state thalli were far less affected by the treatment and recovered well. These results indicate that the thalli are extremely tolerant to liquid nitrogen temperatures only in the dry state.
- Language
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- English
- Open access status
- bronze
- Identifiers
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- DOI 10.1016/j.cryobiol.2016.12.005
- PMID 27988167
- Persistent URL
- https://sonar.ch/global/documents/76526
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