Photosynthetica 1999, 36(12):335-338 | DOI: 10.1023/A:1007124509748

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

J.M. Ducruet1
1 INRA/CEA Saclay, Section de Bioénergétique, Gif-sur-Yvette cedex, France

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.

Additional key words: QA and QB sites; temperature; thermoluminescence; Zea mays

Published: September 1, 1999  Show citation

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Ducruet, J.M. (1999). 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(2), 335-338. doi: 10.1023/A:1007124509748
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