elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Extremotolerance and resistance of lichens: Comparative studies on five species used in astrobiological research - II. Secondary lichen compounds

Meeßen, J. and Sánchez, F. J. and Sadowsky, A. and de la Torre, R. and Ott, S. and de Vera, Jean Pierre Paul (2013) Extremotolerance and resistance of lichens: Comparative studies on five species used in astrobiological research - II. Secondary lichen compounds. Origins of Life and Evolution of Biospheres. Springer. DOI: 10.1007/s11084-013-9348-z ISSN 0169-6149

[img] PDF - Registered users only
965kB

Abstract

Lichens, which are symbioses of a fungus and one or two photoautotrophs, frequently tolerate extreme environmental conditions. This makes them valuable modelsystems in astrobiological research to fathom the limits and limitations of eukaryotic symbioses. Various studies demonstrated the high resistance of selected extremotolerant lichens towards extreme, non-terrestrial abiotic factors including space exposure, hypervelocity impact simulations as well as space and Martian parameter simulations. This study focusses on the diverse set of secondary lichen compounds (SLCs) that act as photo- and UVR-protective substances. Five lichen species used in present-day astrobiological research were compared: Buellia frigida, Circinaria gyrosa, Rhizocarpon geographicum, Xanthoria elegans, and Pleopsidium chlorophanum. Detailed investigation of secondary substances including photosynthetic pigments was performed for whole lichen thalli but also for axenically cultivated mycobionts and photobionts by methods of UV/VIS-spectrophotometry and two types of high performance liquid chromatography (HPLC). Additionally, a set of chemical tests is presented to confirm the formation of melanic compounds in lichen and mycobiont samples. All investigated lichens reveal various sets of SLCs, except C. gyrosa where only melanin was putatively identified. Such studies will help to assess the contribution of SLCs on lichen extremotolerance, to understand the adaptation of lichens to prevalent abiotic stressors of the respective habitat, and to form a basis for interpreting recent and future astrobiological experiments. As most of the identified SLCs demonstrated a high capacity in absorbing UVR, they may also explain the high resistance of lichens towards non-terrestrial UVR.

Item URL in elib:https://elib.dlr.de/83651/
Document Type:Article
Additional Information:Bisher nur online erschienen.
Title:Extremotolerance and resistance of lichens: Comparative studies on five species used in astrobiological research - II. Secondary lichen compounds
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Meeßen, J.Institute of Botany, Heinrich-Heine-Universität, DüsseldorfUNSPECIFIED
Sánchez, F. J.Earth Observation Department, INTA. Ctra. de Ajalvir, Km. 4, Torrejón de Ardoz, 28850 Madrid, SpainUNSPECIFIED
Sadowsky, A.Institute of Botany, Heinrich-Heine-Universität, DüsseldorfUNSPECIFIED
de la Torre, R.Earth Observation Department, INTA. Ctra. de Ajalvir, Km. 4, Torrejón de Ardoz, 28850 Madrid, SpainUNSPECIFIED
Ott, S.Institute of Botany, Heinrich-Heine-University, Universitätsstr.1, 40225 Düsseldorf, GermanyUNSPECIFIED
de Vera, Jean Pierre Pauljean-pierre.devera (at) dlr.deUNSPECIFIED
Date:25 October 2013
Journal or Publication Title:Origins of Life and Evolution of Biospheres
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1007/s11084-013-9348-z
Publisher:Springer
ISSN:0169-6149
Status:Published
Keywords:lichens, secondary lichen compounds, melanin, parietin, rhizocarpic acid, extremotolerance, BIOMEX
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:08 Jan 2014 08:51
Last Modified:06 Sep 2019 15:29

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.