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

HGM Edwards*, CS Cockell, EM Newton, DD Wynn-Williams

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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 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. Copyright (C) 2004 John Wiley Sons, Ltd.

Original languageEnglish
Pages (from-to)463-469
Number of pages9
JournalJournal of Raman Spectroscopy
Volume35
Issue number6
DOIs
Publication statusPublished - Jun 2004

Keywords

  • UV radiation stress
  • Antarctic lichens
  • Mars analogues
  • radiation stress
  • photoprotective pigments
  • ULTRAVIOLET-RADIATION

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