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Protective pigmentation in UVB-screened Antarctic lichens studied by Fourier transform Raman spectroscopy: an extremophile bioresponse to radiation stress

Edwards, Howell G.M.; Cockell, Charles S.; Newton, Emma M. and Wynn-Williams, David D. (2004). Protective pigmentation in UVB-screened Antarctic lichens studied by Fourier transform Raman spectroscopy: an extremophile bioresponse to radiation stress. Journal of Raman Spectroscopy, 35(6) pp. 463–469.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1002/jrs.1172
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Abstract

FT-Raman spectra were obtained for two Antarctic extremophiles, the epilithic lichens Xanthoria elegans and Caloplaca sublobulata from the maritime ecological long-term research site on Leonie Island. Twelve specimens from cloches designed for the filtering out and transmission of UVB radiation over a 2 year period and two specimens from the natural habitat outside the cloches were analysed in terms of their characteristic Raman bands from the two photoprotective pigments parietin and -carotene. Following chemometric analysis, the specimens inside the UVB-protective cloches exhibited a lower parietin:-carotene ratio than specimens from the same habitat that did not have UVB protection. The relative roles of parietin, a passive UVB photoprotectant, and -carotene are discussed and a possible duality of biological function is suggested for these pigments.

Item Type: Journal Article
ISSN: 0377-0486
Extra Information: Some of the symbols may not have transferred correctly into this bibliographic record.
Keywords: UV radiation stress; Antarctic lichens; Mars analogues; radiation stress; photoprotective pigments
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 5213
Depositing User: Users 6044 not found.
Date Deposited: 03 Aug 2006
Last Modified: 02 Sep 2011 09:38
URI: http://oro.open.ac.uk/id/eprint/5213
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