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• W2089248673 abstract "The photoinduced turnover of P-700 (the reaction center chlorophyll a of photosystem I) in higher plant thylakoids was examined at room temperature by observation of the kinetics and amplitude of the transmission signal at 700 nm. The concentration of P-700 functional in cyclic and non-cyclic electron transfer reactions was compared. For the cyclic reactions mediated by N-methylphenazonium-p-methosulfate, 2,3,5,6-tetramethylphenylenediamine, 2,6-dichlorophenolindophenol and N,N,N',N'-tetramethylphenylenediamine and non-cyclic reactions utilizing either methylviologen or NADP+ as acceptor, the illuminated steady-state concentration of P-700+ was shown to be similar. The data support the concept of a homogeneous pool of P-700 that is capable of interaction in both cyclic and non-cyclic electron transfer reactions and are consistent with previous data obtained in vivo. The amplitude and kinetics of the P-700 signal were found to be very dependent upon the composition of the reaction medium and differences were noted for turnover in the cyclic and non-cyclic reactions. Specifically, at white light saturation, the addition of low concentrations of divalent cations, such as Mg2+ or Ca2+, had no effect on the signal amplitude during cyclic reactions, but, in confirmation of previous work, caused an attenuation of the signal amplitude during non-cyclic flow. At low light intensities, the divalent cations caused a similar reduction in redox level of P-700 in the steady-state during non-cyclic flow and also reduced the rate of P-700 photooxidation in the cyclic reactions. The concentration of divalent cation that reduced the signal amplitude of P-700+ during non-cyclic flow was compared with that required for the stimulation of the variable component of fluorescence, and it was shown to be similar with half maximal effects at 1 mM Mg+. The observations confirm that divalent cations control non-cyclic electron transport by an activation of Photosystem II in addition to regulating the distribution of excitation energy between the two photosystems." @default.
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• W2089248673 date "1978-11-01" @default.
• W2089248673 modified "2023-10-16" @default.
• W2089248673 title "Functional homogeneity of P-700 in cyclic and non-cyclic electron transport reactions in thylakoids" @default.
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• W2089248673 doi "https://doi.org/10.1016/0005-2728(78)90177-9" @default.
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