Diel and seasonal changes in fluorescence rise kinetics of three scleractinian corals

Functional Plant Biology : FPB
Ross Hill, Peter J Ralph

Abstract

The effect of diel oscillations in light on the photosynthetic response of three coral species during summer and winter was studied. Fast induction curves revealed detailed information on primary photochemistry as well as redox states of electron acceptors in photosystem II (PSII). The comparison between seasons revealed that similar physiological mechanisms were operating in response to high-light conditions throughout the year and that environmental variables, such as temperature, had no measurable effect between seasons. A diurnal hysteresis was seen in both seasons in Fv / Fm as well as in the fast induction curves, where photosynthetic capacity was lower in the afternoon than in the morning when light intensities were the same. This suggests the operation of dynamic down regulation, following exposure to midday high light. Fast induction curve analysis revealed a decline in the O, J, I and P steps towards midday and a rapid recovery by the late afternoon. The decrease in J and its rapid recovery indicated a drop in the rate of QA reduction as a result of an increase in non-photochemical quenching (NPQ). The P step increased in amplitude in the first hours of sunlight, which suggests an increased oxidation of the plastoquin...Continue Reading

References

Apr 12, 2001·Plant Physiology·P MüllerK K Niyogi
Apr 19, 2002·Journal of Photochemistry and Photobiology. B, Biology·Nicole A Dijkman, Bernd M A Kroon
Jul 1, 1982·Proceedings of the National Academy of Sciences of the United States of America·P Bennoun

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Citations

Sep 10, 2014·Frontiers in Microbiology·Melissa S Roth

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Software Mentioned

SigmaPlot
SPSS

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