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Relation Between the Heat-Induced Increase of F0 Fluorescence and a Shift in the Electronic Equilibrium at the Acceptor Side of Photosystem 2

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Photosynthetica

Abstract

F0 fluorescence and thermoluminescence (TL) were recorded simultaneously on various dark-adapted leaf samples. Above 40 °C, a sharp peak of TL coincided with the onset of the heat-induced F0 rise. It results from a back-transfer of an electron from the secondary QB -to the primary acceptor QA of photosystem 2, followed by a luminescence-emitting recombination with Tyr-D1. This demonstrates that the critical temperature at which the F0 starts rising also corresponds to a shift towards the left of the QA↔QB - equilibrium.

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  1. INRA/CEA Saclay, Section de Bioénergétique, Bât. 532, F-91191, Gif-sur-Yvette cedex, France

    J.M. Ducruet

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  1. J.M. Ducruet
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Ducruet, J. Relation Between the Heat-Induced Increase of F0 Fluorescence and a Shift in the Electronic Equilibrium at the Acceptor Side of Photosystem 2. Photosynthetica 37, 335–338 (1999). https://doi.org/10.1023/A:1007124509748

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  • DOI: https://doi.org/10.1023/A:1007124509748

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