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Acclimation of photosynthesis and pigments to seasonally changing light conditions in the endemic Antarctic red macroalga Palmaria decipiens Lüder, U.H.; Knoetzel, J.; Wiencke, C. (2001). Acclimation of photosynthesis and pigments to seasonally changing light conditions in the endemic Antarctic red macroalga Palmaria decipiens. Polar Biol. 24(8): 598-603. https://dx.doi.org/10.1007/s003000100260 In: Polar Biology. Springer-Verlag: Berlin; Heidelberg. ISSN 0722-4060; e-ISSN 1432-2056 Is gerelateerd aan: Lüder, U.H.; Knoetzel, J.; Wiencke, C. (2002). Acclimation of photosynthesis and pigments to seasonally changing light conditions in the endemic Antarctic red macroalga Palmaria decipiens, in: Arntz, W.E. et al. (Ed.) Ecological studies in the Antarctic sea ice zone: results of EASIZ Midterm Symposium. pp. 231-236, meer

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Trefwoorden

Chemical compounds > Organic compounds > Carbohydrates > Glycosides > Pigments > Photosynthetic pigments Chemical reactions > Photochemical reactions > Photosynthesis Light duration PSW, Antarctica, South Shetland I., King George I. Seasonal changes Palmaria decipiens (Reinsch) R.W.Ricker, 1987 [WoRMS] Cantelowes [Marine Regions] Marien/Kust

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Auteurs		Top
Lüder, U.H. Knoetzel, J. Wiencke, C.

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Abstract

The influence of seasonally fluctuating Antarctic daylengths on the photosynthetic apparatus of Palmaria decipiens was studied in culture experiments. Maximal photosynthetic activity (ETRmax) and maximal quantum yield (Fv/Fm), measured by in vivo chlorophyll fluorescence, and concentrations of pigments (phycobiliproteins and Chl a) were determined monthly. Fv/Fm remained constantly high between 0.62 and 0.67 during mid-autumn, winter and spring. ETRmax and pigment contents increased continuously in mid-autumn and winter and were highest in spring. A positive correlation between pigments and ETRmax was found. In summer, ETRmax, Fv/Fm and pigment levels decreased to their lowest values. P. decipiens acclimated by increasing phycobilisome (PBS) number and changing PBS structure, probably changing rod length and rod number. The data show that P. decipiens is efficiently adapted to the short period of favourable light conditions in the field. A photoperiodic control of pigment synthesis triggered by daylength is suggested.

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