Bisulfite compounds as metabolic inhibitors: nonspecific effects on membranes |
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Authors: | Luttge Ulrich; Osmond C Barry; Ball Erika; Brinckmann Enno; Kinze Gabriele |
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Institution: | 1Fachbereich Biologie der Technischen Hochschule D-6100 Darmstadt, Germany
2Research School of Biological Sciences, Australian National University Canberra City, 2601, Australia |
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Abstract: | Bisulfite compounds are shown to be nonspecific inhibitors ofphotosynthetic processes and of ion transport in green tissues.CO2 fixation and light-dependent transient changes in externalpH are inhibited about 50% by 5x104 M glyoxal-Na-bisulfite.Chloride uptake in the light and in the dark is inhibited tothe same extent at this concentration. At 5x103 M theinhibitor reduces ATP levels in the light and in the dark, andeffects on glycolate oxidase and PEP carboxylase are observed.The extent of inhibition is dependent on time of treatment withglyoxal-Na-bisulfite and freshly prepared NaHSO3 is equallyas effective as the addition compound. Possible explanations of the bisulfite effects and the relationshipsto SO2 effects on photosynthesis are discussed. (Received September 1, 1971; ) |
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