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Desiccation and low temperature attenuate the effect of UVC254 nm in the photobiont of the astrobiologically relevant lichens Circinaria gyrosa and Buellia frigida

Backhaus, T. and de la Torre Noetzel, R. and Lyhme, K. and de Vera, Jean Pierre Paul and Meeßen, Joachim (2014) Desiccation and low temperature attenuate the effect of UVC254 nm in the photobiont of the astrobiologically relevant lichens Circinaria gyrosa and Buellia frigida. International Journal of Astrobiology, pp. 1-10. Cambridge University Press. DOI: 10.1017/S1473550414000470 ISSN 1473-5504

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Abstract

Several investigations on lichen photobionts (PBs) after exposure to simulated or real-space parameters consistently reported high viability and recovery of photosynthetic activity. These studies focused on PBs within lichen thalli, mostly exposed in a metabolically inactive state. In contrast, a recent study exposed isolated and metabolically active PBs to the non-terrestrial stressor UVC254 nm and found strong impairment of photosynthetic activity and photo-protective mechanisms (Meeßen et al. in 2014b). Under space and Mars conditions, UVC is accompanied by other stressors as extreme desiccation and low temperatures. The present study exposed the PBs of Buellia frigida and Circinaria gyrosa, to UVC in combination with desiccation and subzero temperatures to gain better insight into the combined stressors’ effect and the PBs’ inherent potential of resistance. These effects were examined by chlorophyll a fluorescence which is a good indicator of photosynthetic activity (Lüttge& Büdel in 2010) and widely used to test the viability of PBs after (simulated) space exposure. The present results reveal fast recovery of photosynthetic activity after desiccation and subzero temperatures. Moreover, they demonstrate that desiccation and cold confer an additional protective effect on the investigated PBs and attenuate the PBs’ reaction to another stressor – even if it is a non-terrestrial one such as UVC. Besides other protective mechanisms (anhydrobiosis, morphological–anatomical traits and secondary lichen compounds), these findings may help to explain the high resistance of lichens observed in astrobiological studies.

Item URL in elib:https://elib.dlr.de/92302/
Document Type:Article
Additional Information:Bisher nur online erschienen.
Title:Desiccation and low temperature attenuate the effect of UVC254 nm in the photobiont of the astrobiologically relevant lichens Circinaria gyrosa and Buellia frigida
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Backhaus, T.Institut für Botanik, Heinrich-Heine-Universität (HHU), Universitätsstr.1, 40225 Düsseldorf, GermanyUNSPECIFIED
de la Torre Noetzel, R.Department of Earth Observation, Area of Atmospheric Research and Instrumentation, INTA, 28850 Torrejón de Ardoz, Madrid, SpainUNSPECIFIED
Lyhme, K.Institut für Botanik, Heinrich-Heine-Universität (HHU), Universitätsstr.1, 40225 Düsseldorf, GermanyUNSPECIFIED
de Vera, Jean Pierre Pauljean-pierre.devera (at) dlr.deUNSPECIFIED
Meeßen, JoachimInstitute of Botany, Heinrich-Heine University, Universitätsstr.1, 40225 Düsseldorf, GermanyUNSPECIFIED
Date:4 September 2014
Journal or Publication Title:International Journal of Astrobiology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1017/S1473550414000470
Page Range:pp. 1-10
Publisher:Cambridge University Press
ISSN:1473-5504
Status:Published
Keywords:astrobiology, BIOMEX, extremotolerance, lichens, photobiont, photodamage, UVC
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben Exploration des Sonnensystems
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Experimentelle Planetenphysik
Deposited By: de Vera, Dr. Jean Pierre Paul
Deposited On:24 Nov 2014 08:20
Last Modified:01 Dec 2018 19:50

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