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Responses of Antarctic Iridaea cordata (Rhodophyta) tetraspores exposed to ultraviolet radiation
Alfred Wegener Inst Polar & Marine Res, Sect Funct Ecol, Dept Seaweed Biol, D-27570 Bremerhaven, Germany..
Inst Polar Ecol, D-24148 Kiel, Germany..
Univ Gothenburg, Dept Marine Ecol, SE-40530 Gothenburg, Sweden..
Univ Hamburg, Biozentrum Klein Flottbek, D-22609 Hamburg, Germany..
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2009 (English)In: Phycological Research, ISSN 1322-0829, E-ISSN 1440-1835, Vol. 57, no 3, 186-193 p.Article in journal (Refereed) Published
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Text
Abstract [en]

P>In Antarctica ozone depletion is highest during spring, coinciding with the reproduction of many seaweed species. Propagules are the life-stage of an alga most susceptible to environmental perturbations. Therefore, fertile thalli of Iridaea cordata (Turner) Bory (Rhodophyta) were collected in the eulittoral of King George Island (Antarctica) to examine spore susceptibility to ultraviolet radiation (UVR). In the laboratory, freshly released tetraspores were exposed to photosynthetically active radiation (PAR) (400-700 nm), PAR+UV-A (320-700 nm) or PAR+UV-A+UV-B (280-700 nm). Photosynthetic efficiency was measured during 1-8 h of exposure and after 48 h of recovery. Additionally, mycosporine-like amino acids (MAAs) and DNA damage were determined. Saturating irradiance of photosynthesis of freshly released tetraspores was 57 mu mol photons m(-2) s(-1). Exposure to increasing fluence of PAR reduced photosynthetic efficiency. UVR further decreased the photosynthetic efficiencies of the tetraspores but spores were able to recover completely after UVR exposure and 2 days post-cultivation under low PAR. DNA damage was minimal and lesions were effectively repaired under photoreactivating light. Concentrations of the MAAs shinorine and palythine were higher in tetraspores treated with UVR than in spores only exposed to PAR. Generally, the tetraspores show a good UV tolerance. This flexible response of the tetraspores of this species to changing radiation conditions enables the alga to grow along a considerable depth gradient from the sublittoral to the eulittoral where they can be exposed to enhanced UVBR under conditions of stratospheric ozone depletion.

Place, publisher, year, edition, pages
2009. Vol. 57, no 3, 186-193 p.
Keyword [en]
Antarctica, DNA damage, mycosporine-like amino acids, P-E curve, photosynthetic efficiency, tetraspores, ultraviolet radiation
Research subject
SWEDARP; SWEDARP 2004/05, UV-strålningens effekter på bentiska primärproducenter i Antarktis
Identifiers
URN: urn:nbn:se:polar:diva-2555DOI: 10.1111/j.1440-1835.2009.00538.xISI: 000269191300005OAI: oai:DiVA.org:polar-2555DiVA: diva2:883100
Available from: 2015-12-16 Created: 2015-12-16 Last updated: 2015-12-16

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