Nonphotochemical reduction of the plastoquinone pool in sunflower leaves originates from chlororespiration

Plant Physiology
T S FeildDonald R Ort

Abstract

We investigated the relationship between nonphotochemical plastoquinone reduction and chlororespiration in leaves of growth-chamber-grown sunflower (Helianthus annuus L.). Following a short induction period, leaves of previously illuminated sunflower showed a substantially increased level of minimal fluorescence following a light-to-dark transition. This increase in minimal fluorescence was reversed by far-red illumination, inhibited by rotenone or photooxidative methyl viologen treatment, and stimulated by fumigation with CO. Using flash-induced electrochromic absorption-change measurements, we observed that the capacity of sunflower to reduce plastoquinone in the dark influenced the activation state of the chloroplast ATP synthase, although chlororespiratory transmembrane electrochemical potential formation alone does not fully explain our observations. We have added several important new observations to the work of others, forming, to our knowledge, the first strong experimental evidence that chlororespiratory, nonphotochemical plastoquinone reduction and plastoquinol oxidation occur in the chloroplasts of higher plants. We have introduced procedures for monitoring and manipulating chlorores-piratory activity in leaves that ...Continue Reading

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Citations

May 10, 2007·Photosynthesis Research·Szilvia Z TóthReto J Strasser
Sep 30, 2008·Photosynthesis Research·Alexander G IvanovNorman P A Huner
Jan 13, 2000·Biochimica Et Biophysica Acta·M WankeE Swiezewska
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