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The mechanisms of fatty-acid inhibition of electron transport in chloroplasts

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Abstract

Unsaturated fatty acids at concentrations of 1–2 μmol mg-1 chlorophyll decrease the intensity of long-lived delayed fluorescence and inhibit the Hill reaction in Pisum sativum L. chloroplasts in a pH-dependent and reversible manner. A charged form of the fatty acids is two times more effective than an undissociated form. Fatty acids, anionic and cationic detergents and urea inhibit activity and decrease the temperature of heat inactivation of the water-spilitting system. Sucrose at a concentration of 2.5 M protects chloroplasts against the effects of these compounds. It is concluded that their action can be explained by the denaturation of the water-splitting protein.

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Abbreviations

Chl:

chlorophyll

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Authors and Affiliations

  1. Biophysics Department, Faculty of Biology, M.V. Lomonosov State University, Lenin Hills, 117234, Moscow, USSR

    Pavel S. Venediktov & Alla A. Krivoshejeva

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  1. Pavel S. Venediktov
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  2. Alla A. Krivoshejeva
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Venediktov, P.S., Krivoshejeva, A.A. The mechanisms of fatty-acid inhibition of electron transport in chloroplasts. Planta 159, 411–414 (1983). https://doi.org/10.1007/BF00392076

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  • DOI: https://doi.org/10.1007/BF00392076

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