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• W2050637209 abstract "Spinach chloroplasts were dark adapted and then submitted to a sequence of short saturating flashes. The resulting absorption changes in the near ultraviolet were analyzed and attributed to the donor and acceptor sides of Photosystem II. Our results provide a spectroscopic support to some current models of these parts of the photosynthetic electron transport. In Tris-treated chloroplasts (supplied with artificial donors) the absorption changes are largely due to the acceptor side. After each flash the signal decays with a fast phase (t12 = 1.2 ms at 9 °C) leaving a stationary level (on a 100-ms time scale). The fast phase has a small amplitude after odd-numbered flashes, whereas the stationary level behaves in a complementary fashion. The non-decaying signal is attributed mostly to the reduced secondary acceptor (A2−) and the fast phase to the simultaneous reoxidation of A2− and of the reduced primary acceptor (A1−). The effect of 3-(3,4-dichlorophenyl)-1, 1-dimethylurea and of redox mediators (ascorbate, ferricyanide) also support this assignment. A fraction of A2 is shown to be reduced in dark-adapted chloroplasts, as proposed by Velthuys and Amesz (Biochim. Biophys. Acta (1974) 333, 85–94). The difference spectra support the view that A1− and A2− are plastoquinone radical anions. There are also some absorption changes that we cannot identify. In untreated chloroplasts a non-decaying absorption change (“slow phase”) occurs with a 4-flash periodicity. It is attributed to the transitions among the S states associated with the O2-evolving complex. A fast phase (t12 = 1.2 ms) in the decay following the first two flashes behaves like in Tris-treated chloroplasts, so that the assignment is tentatively the same. After the third flash, however, the magnitude of this fast phase is too large according to the hypothesis, so that there may be some contribution from the donor side. The fast phases become slower at lower pH (5.5 instead of 7.6), although there is no evidence for a protonation A1− or A2−." @default.
• W2050637209 created "2016-06-24" @default.
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• W2050637209 date "1977-08-01" @default.
• W2050637209 modified "2023-09-25" @default.
• W2050637209 title "Analysis of absorption changes in the ultraviolet related to charge-accumulating electron carriers in Photosystem II of chloroplasts" @default.
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• W2050637209 doi "https://doi.org/10.1016/0005-2728(77)90167-0" @default.
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