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Decrease of Fluorescence Intensity After the K Step in Chlorophyll a Fluorescence Induction is Suppressed by Electron Acceptors and Donors to Photosystem 2

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Photosynthetica

Abstract

Chlorophyll a fluorescence induction measured by a fluorometer with a high temperature stressed plant material shows a new K step which is a clear peak due to fast fluorescence rise and subsequent decrease of fluorescence intensity. We focused on an explanation of the decrease of fluorescence after the K step using artificial electron acceptors and donors to photosystem 2 (PS2). Addition of the artificial electron acceptors or donors suppressed the decrease of fluorescence after the K step. We suggest that the decrease mainly reflects (by more than 81 %) an energy loss process in the reaction centre of PS2 which is most probably a nonradiative charge recombination between P680+ (oxidised primary electron donor in PS2) and a negative charge stored on either Pheo− or QA − (reduced primary electron acceptor of PS2 and reduced primary quinone electron acceptor of PS2, respectively). We suggest that the energy loss process is only possible when the inhibition of both the donor and the acceptor sides of PS2 occurs.

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Authors and Affiliations

  1. Department of Experimental Physics, Faculty of Science, Palacký University, tř. Svobody 26, 771 46, Olomouc, Czech Republic

    D. Lazár, P. Pospíšil & J. Nauš

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  1. D. Lazár
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  2. P. Pospíšil
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  3. J. Nauš
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Lazár, D., Pospíšil, P. & Nauš, J. Decrease of Fluorescence Intensity After the K Step in Chlorophyll a Fluorescence Induction is Suppressed by Electron Acceptors and Donors to Photosystem 2. Photosynthetica 37, 255–265 (1999). https://doi.org/10.1023/A:1007112222952

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