Blooming of cyanobacteria in turbulent water with steep light gradients: The effect of intermittent light and dark periods on the oxygen evolution capacity of Synechocystis sp. PCC 6803 |
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Authors: | Hendrik Schubert Hans C.P. Matthijs Luuc R. Mur Ulrich Schiewer |
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Affiliation: | Universität Rostock, FB Biologie, Freiligrathstrasse 7 / 8, D-18051 Rostock, Germany;Amsterdam Research Institute for Substances in Ecosystems, Laboratorium voor Microbiologie, Nieuwe Achtergracht 127, 1018 WS Amsterdam, The Netherlands |
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Abstract: | Abstract: The influence of intermittent high-light dosage on Synechocystis sp. PCC 6803 with respect to oxygen evolution capacity, fluorescence yield and carotenoid pigment pattern was investigated, using high-light- and low-light-adapted cultures. The results showed that this cyanobacterium was able to survive high light stress for a full day if this stress was applied on and off with intermittently presented recovery periods in darkness. Enhanced respiratory activity in the high-light adapted cells was detected and this may be an important factor in preventing photodamage under high light stress. Cyanobacterial photosynthetic and respiratory electron transfer pathways are both present within the same membrane, and share common electron carriers. The role of respiratory activity in preventing overexcitation of photosystem 2 is discussed with regard to cyanobacterial ecology. |
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Keywords: | Pigmentation Light stress Fluorescence Recovery of photosynthesis |
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