Changes in Ultrastructure, Photosynthetic Activity and Pigments in the Antarctic Red Alga Palmaria decipiens during Acclimation to UV Radiation
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F. Poppe
Abstract
The effect of ultraviolet (UV) radiation on ultrastructure, variable fluorescence of photosystem II and concentrations of photosynthetic pigments in the endemic Antarctic Rhodophyta Palmaria decipiens was studied. After 6 and 8 h of artificial UV-exposure a vesiculation of the chloroplast thylakoids and changes in the membrane structure of mitochondria were observed, which disappeared after 12 h of UV treatment. A 60% reduction of maximum quantum yield of photosynthesis (Fv/Fm) was obtained after 4 h of UV-A+B exposure, which recovered up to 80% after 8 h in darkness and 10 h of white light. Exclusion of UV-B led to a minor reduction of Fv/Fm to 60% in the first 4 h of irradiation. The concentration of chlorophyll a increased after 4 h of UV exposure, whereas concentrations of phycoerythrin and phycocyanin decreased at the same time. After 12–16 h of UV exposure no significant changes compared to the control were detectable. These findings give an insight into the fine structural and physiological changes during and after UV exposure, and indicate an acclimation of the alga to UV radiation.
Copyright © 2002 by Walter de Gruyter GmbH & Co. KG
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- Intraplant Variation in Nuclear DNA Content in Laminaria saccharina and Alaria esculenta (Phaeophyceae)
- A Checklist of the Seaweeds of the Mediterranean and Atlantic Coasts of Morocco. II. Phaeophyceae
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- Seasonal Dynamics of a Subtidal North-Western Mediterranean Macroalgal Community in Relation to Depth and Substrate Inclination
- Changes in Ultrastructure, Photosynthetic Activity and Pigments in the Antarctic Red Alga Palmaria decipiens during Acclimation to UV Radiation
- Physode Distribution and the Effect of Thallus Sunburn in Hormosira banksii (Fucales, Phaeophyceae)
- Symptoms of Eutrophication in Intertidal Macroalgal Assemblages of Nuevo Gulf (Patagonia, Argentina)
- Morphology and Ecology of New Records of Cyanobacteria Belonging to the Genus Oscillatoria from Hong Kong Rocky Shores
- Seasonality in Algal Assemblages on Upwelling-influenced Coral Reefs in the Colombian Caribbean
- Vegetative and Reproductive Morphology of Polysiphonia lanosa (Rhodomelaceae, Rhodophyta) from Ireland
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