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SENSITIVITY OF ANTARCTIC UROSPORA PENICILLIFORMIS (ULOTRICHALES, CHLOROPHYTA) TO ULTRAVIOLET RADIATION IS LIFE-STAGE DEPENDENT
Inst Polar Ecol, D-24148 Kiel, Germany..
Consejo Nacl Invest Cient & Tecn, Inst Antartico Argentino, RA-1033 Buenos Aires, DF, Argentina..
Alfred Wegener Inst Polar & Marine Res, Dept Seaweed Biol, Sect Funct Ecol, D-27570 Bremerhaven, Germany..
Univ Hamburg, Biozentrum Klein Flottbek, D-22609 Hamburg, Germany..
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2009 (English)In: Journal of Phycology, ISSN 0022-3646, E-ISSN 1529-8817, Vol. 45, no 3, 600-609 p.Article in journal (Refereed) Published
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Abstract [en]

The sensitivity of different life stages of the eulittoral green alga Urospora penicilliformis (Roth) Aresch. to ultraviolet radiation (UVR) was examined in the laboratory. Gametophytic filaments and propagules (zoospores and gametes) released from filaments were separately exposed to different fluence of radiation treatments consisting of PAR (P = 400-700 nm), PAR + ultraviolet A (UVA) (PA, UVA = 320-400 nm), and PAR + UVA + ultraviolet B (UVB) (PAB, UVB = 280-320 nm). Photophysiological indices (ETR(max), E(k), and alpha) derived from rapid light curves were measured in controls, while photosynthetic efficiency and amount of DNA lesions in terms of cyclobutane pyrimidine dimers (CPDs) were measured after exposure to radiation treatments and after recovery in low PAR; pigments of propagules were quantified after exposure treatment only. The photosynthetic conversion efficiency (alpha) and photosynthetic capacity (rETR(max)) were higher in gametophytes compared with the propagules. The propagules were slightly more sensitive to UVB-induced DNA damage; however, both life stages of the eulittoral inhabiting turf alga were not severely affected by the negative impacts of UVR. Exposure to a maximum of 8 h UVR caused mild effects on the photochemical efficiency of PSII and induced minimal DNA lesions in both the gametophytes and propagules. Pigment concentrations were not significantly different between PAR-exposed and PAR + UVR-exposed propagules. Our data showed that U. penicilliformis from the Antarctic is rather insensitive to the applied UVR. This amphi-equatorial species possesses different protective mechanisms that can cope with high UVR in cold-temperate waters of both hemispheres and in polar regions under conditions of increasing UVR as a consequence of further reduction of stratospheric ozone.

Place, publisher, year, edition, pages
2009. Vol. 45, no 3, 600-609 p.
Keyword [en]
carotenoids, cyclobutane pyrimidine dimers, DNA damage, gametophytes, P-E curves, photosynthetic efficiency, pigments, propagules, rapid light curves, Urospora penicilliformis, UVR, xanthophyll
Research subject
SWEDARP; SWEDARP 2004/05, UV-strålningens effekter på bentiska primärproducenter i Antarktis
Identifiers
URN: urn:nbn:se:polar:diva-2558DOI: 10.1111/j.1529-8817.2009.00691.xISI: 000266714200008OAI: oai:DiVA.org:polar-2558DiVA: diva2:883107
Available from: 2015-12-16 Created: 2015-12-16 Last updated: 2015-12-16

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