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.; 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). 463-469. 10.1002/jrs.1172Full text not available from this repository.
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 beta-carotene. Following chemometric analysis, the specimens inside the UVB-protective cloches exhibited a lower parietin:beta-carotene ratio than specimens from the same habitat that did not have UVB protection. The relative roles of parietin, a passive UVB photoprotectant, and beta-carotene are discussed and a possible duality of biological function is suggested for these pigments.
|Programmes:||BAS Programmes > Antarctic Science in the Global Context (2000-2005) > Life at the Edge - Stresses and Thresholds|
|Additional Keywords:||UV radiation stress, Antarctic lichens, Mars analogues, radiation stress, photoprotective pigments|
|NORA Subject Terms:||Botany
Ecology and Environment
|Date made live:||16 Jan 2012 13:24|
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