Publication details

Oxygen evolution rate in Antarctic filamentous alga Stigeoclonium sp. evaluated by optodes relates to chlorophyll fluorescence parameters

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Year of publication 2018
Type Article in Periodical
Magazine / Source Czech Polar Reports
MU Faculty or unit

Faculty of Science

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Keywords effective quantum yield; oxygen evolution rate; Antarctic phototroph photosynthesis
Description Photosynthetic reactions of algal communities, the essential component of primary production in Polar Regions, are strongly dependent on environmental factors. Among them, availability and amount of light in particular parts of growing season are of major importance. In this paper, the response of the photosynthetic processes of a filamentous freshwater alga to photosynthetically active radiation (PAR) was studied by two approaches. The simultaneous measurements of the effective quantum yield (QYPSII) and oxygen evolution rate (OER) at stepwise increasing photosynthetically active radiation provided data for beneficial correlation analysis of the QYPSII to OER relationship in a wide range of PAR. In this study, the culture of filamentous alga Stigeoclonium sp. was analyzed. The linear relationship between QYPSII and OER was found for the low PAR (the range of 0 – 200 umol.m-2.s-1). At high PAR levels (200 – 1000 umol.m-2.s-1) another linear relationship with different slope was found. The approach combining the fluorometric and oxymetric method might be used for calibration of data in follow up studies and, consequently for evaluation of photosynthetic rates (O2 evolution) from chlorophyll fluorescence data.
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