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Regulation of the photosynthetic electron transport during dark-light transitions by activation of the ferredoxin-NADP+-oxidoreductase in higher plants

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Abstract

Absorbance changes associated with the oxidation and reduction of cytochrome f belong to the classical observations about the interaction of the two photosystems. A complex induction pattern of cytochrome f oxidation results, if both photosystems are excited simultaneously. This indicates a light-modulated regulation of the photosynthetic electron transport, which we examined for intact biological systems of decreasing complexity. The ferredoxin-NADP+-oxidoreductase (FNR) is suggested to be activated by light and inactivated in the dark. This is pointed out by the kinetics of variable fluorescence and by the influence of different artificial electron acceptors on the cytochrome f kinetics. The photoreduction of NADP+ by carefully prepared thylakoids demonstrates the activation process directly.

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Authors and Affiliations

  1. Institut für Allgemeine Botanik, Saarstr. 21, D-6500, Mainz, Federal Republic of Germany

    W. Rühle, R. Pschorn & A. Wild

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  1. W. Rühle
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  2. R. Pschorn
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  3. A. Wild
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This work was supported by the Deutsche Forschungsgemeinschaft.

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Rühle, W., Pschorn, R. & Wild, A. Regulation of the photosynthetic electron transport during dark-light transitions by activation of the ferredoxin-NADP+-oxidoreductase in higher plants. Photosynth Res 11, 161–171 (1987). https://doi.org/10.1007/BF00018274

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  • DOI: https://doi.org/10.1007/BF00018274

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