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Humidity interaction of lichens under astrobiological aspects: the impact of UVC exposure on their water retention properties

  • We quantitatively studied the hydration and dehydration behaviour of the three astrobiological model lichens Xanthoria elegans, Buellia frigida and Circinaria gyrosa by thermoanalysis and gravimetric isotherm measurements under close-to-Martian environmental conditions in terms of low temperature and low pressure. Additionally, the impact of UVC exposure on the isolated symbionts of B. frigida and X. elegans was studied by thermoanalysis and mass spectrometry as well as by gravimetric isotherm measurements. The thermal analysis revealed whewellite as a component of C. gyrosa which was not found in B. frigida and X. elegans. Neither the water retention nor the thermal behaviour of symbionts changed when irradiated with UVC under dry conditions. On the other hand, UVC irradiation of the wet mycobiont of B. frigida had a distinct impact on the hydration/dehydration ability which was not observed for the mycobiont of X. elegans. Possibly the melanin of B. frigida's mycobiont, that is not present in X. elegans, or a specifically damaged acetamido group of the chitin of B. frigida may be the sources of additional UVC-induced sorption sites for water associated with the UVC exposure.

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Metadaten
URN:urn:nbn:de:kobv:526-opus4-10837
Publisher DOI:https://doi.org/10.1017/S147355041500004X
Author:Jochen Jänchen, Joachim Meessen, Thomas H. Herzog, M. Feist, Rosa de la Torre NoetzelORCiD, Jean-Pierre Paul de VeraORCiD
ISSN:1475-3006
Parent Title (English):International Journal of Astrobiology
Document Type:Article
Language:English
Year of Publication:2015
Volume:14
Issue:3
First Page:445
Last Page:456
Faculties an central facilities:Fachbereich Ingenieur- und Naturwissenschaften
Publishing Institution:Technische Hochschule Wildau
Tag:Mars; UVC irradiation; lichen; thermoanalysis; water sorption isotherms
Source:Jänchen, J., Meeßen, J., Herzog, T., Feist, M., De la Torre, R., & DeVera, J. (2015). Humidity interaction of lichens under astrobiological aspects: The impact of UVC exposure on their water retention properties. International Journal of Astrobiology, 14(3), 445-456. doi:10.1017/S147355041500004X
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 57 Biowissenschaften; Biologie / 570 Biowissenschaften; Biologie
Licence (German):DFG-geförderte Allianz- bzw. Nationallizenz
Release Date:2019/02/06
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