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Journal of Plankton Research Vol.23 no.1 pp.57-66, 2001
© Oxford University Press 2001

Photosystem II Electron Transport Rates and Oxygen Production in Natural Waterblooms of Freshwater Cyanobacteria During a Diel Cycle

JiRí Masojídek1,,6, Johan U. Grobbelaar2, Libor Pechar3,,5 and Michal KoblíZek1,,4

1 Research Centre for Photosynthesis, Institute of Microbiology, Academy of Sciences, 379 81 TReboN, Czech Republic, 2 Department of Botany and Genetics, University of the Ofs, Box 339, Bloemfontein 9300, South Africa, 3 Institute of Botany, Academy of Sciences, 379 82 TR;eboN, Czech Republic, 4 Research Centre for Photosynthesis, Institute of Landscape Ecology, Novy Zámek 136, 373 33 Nové Hrady, Czech Republic and 5 Applied Ecology Laboratory, University of South Bohemia, 37005 ceské BudEjovice, Czech Republic

6 To whom correspondence should be addressed

The relationship between electron transport rate through PSII and photosynthetic oxygen evolution in cyanobacterial surface waterblooms was followed over a diel cycle. Chlorophyll fluorescence and photosynthetic oxygen evolution (PSOE) measurements were performed in a small-volume incubatin chamber on samples taken from a fish pond. Measurement of light-response curves showed a close to linear relationship between electron transport rates (ETR) and PSOE up to irradiancies of 800 quanta–2 s–1, except during mid-morning conditions. At higher irradiances, the relationship was non-linear. The regression coefficient {kappa} (= PSOE/ETR) exhibited wide variation during the day (3.8–9.2), indicating that the use of ETR as a measure of PSOE in cyanobacterial waterblooms should be approached with caution. The involvement of alternate oxygen-consuming electron transfer pathways is discussed as a possible explanation for this discrepancy.


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