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Effects of enhanced UV-B radiation in the field on the concentration of phenolics and chlorophyll fluorescence in two boreal and arctic-alpine lichens
Responsible organisation
2005 (English)In: Environmental and Experimental Botany, ISSN 0098-8472, E-ISSN 1873-7307, Vol. 53, no 2, 139-149 p.Article in journal (Refereed) Published
Abstract [en]

Lichens constitute a prominent part of the vegetation at high latitudes and altitudes, but the effects of UV-B radiation on these symbiotic organisms are not well known. In a northern boreal site (Abisko, northern Sweden), the usnic acid-producing lichens Flavocetraria nivalis and Nephroma arcticum were exposed to enhanced UV-B radiation, corresponding to 25% ozone depletion, for two and one growing seasons, respectively. They were compared with lichens grown under ambient UV-B and harvested fresh from the field. The treated thalli of F nivalis had been transplanted from a site 24 km from the treatment site. From this source locality, untreated thalli were also harvested. Enhanced UV-B did not affect concentrations of usnic acid and the two depsides phenarctin and nephroarctin. A gradual decline of usnic acid, probably coupled to unusually long periods of dry, sunny weather, was observed both under enhanced and ambient UV-B and in untreated thalli. Photosystem II efficiency in both species was slightly reduced by enhanced UV-B. However, differences between seasons were larger than differences between treatments, which indicate that UV-B effects are minor in comparison to other climatic variables. Concentrations of UV-B-absorbing phenolics in lichens do not show a simple relationship to UV-B dose and therefore cannot be used as bioindicators of UV-B levels. (c) 2004 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2005. Vol. 53, no 2, 139-149 p.
Keyword [en]
ultraviolet-B lichen; UV-absorbing substances; usnic acid; depsides; photosystem II efficiency; seasonal trends
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Natural Sciences
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URN: urn:nbn:se:polar:diva-3647DOI: 10.1016/j.envexpbot.2004.03.009OAI: oai:DiVA.org:polar-3647DiVA: diva2:1103491
Available from: 2017-05-30 Created: 2017-05-30 Last updated: 2017-05-30

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CiteExportLink to record
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Citation style
  • apa
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  • vancouver
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  • de-DE
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