Photosynthetic Electron Transport under Phosphorylating Conditions as Influenced by Different Concentrations of Various Salts |
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Authors: | OSMAN, MOHAMED EL-ANWAR H. EL-SHENTENAWY, FATMA |
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Abstract: | Osman, M. E-A. H. and El-Shentenawy, F. 1988. Photosyntheticelectron transport under phosphorylating conditions as influencedby different concentrations of various salts.J. exp.Bot. 39: 859863. The rate of light-induced electron transport by isolated spinachthylakoids under phosphorylating conditions, as affected bydifferent concentrations of Br, Cl, NO3,HCO3, SO42 and CO32 has been investigated.The results show that both low and high concentrations of HCO32stimulated the oxygen evolution capacity under phosphorylatingconditions, whereas only low concentrations of CO32,SO42 and Cl stimulated the oxygen evolution capacity.However, irrespective of concentration, both Br and NO3reduced this capacity. The rate of photosynthetic electron transportwas generally stimulated by addition of ADP, even in cases whereelectron transport was inhibited by addition of bromide andnitrate. The different concentrations of these anions also causedreduction of the power generated by proton pumping and usedfor phosphorylation. The greatest level of reduction was observedin the presence of high concentrations of Cl and HCO3. Key words: Spinach thylakoids, photosynthetic electron transport, phosphorylation |
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