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• W2146164067 abstract "We have studied the inhibition of photosynthetic electron transport by UV-A (320–400 nm) radiation in isolated spinach thylakoids. Measurements of Photosystem II (PSII) and Photosystem I activity by Clark-type oxygen electrode demonstrated that electron flow is impaired primarily in PSII. The site and mechanism of UV-A induced damage within PSII was assessed by flash-induced oxygen and thermoluminescence (TL) measurements. The flash pattern of oxygen evolution showed an increased amount of the S0 state in the dark, which indicate a direct effect of UV-A in the water-oxidizing complex. TL measurements revealed the UV-A induced loss of PSII centers in which charge recombination between the S2 state of the water oxidizing complex and the semireduced QA− and QB− quinone electron acceptors occur. Flash-induced oscillation of the B TL band, originating from the S2QB− recombination, showed a decreased amplitude after the second flash relative to that after the first one, which is consistent with a decrease in the amount of QB− relative to QB in dark adapted samples. The efficiency of UV-A light in inhibiting PSII electron transport exceeds that of visible light 45-fold on the basis of equal energy and 60-fold on the basis of equal photon number, respectively. In conclusion, our data show that UV-A radiation is highly damaging for PSII, whose electron transport is affected both at the water oxidizing complex, and the binding site of the QB quinone electron acceptor in a similar way to that caused by UV-B radiation." @default.
• W2146164067 created "2016-06-24" @default.
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• W2146164067 date "2000-01-01" @default.
• W2146164067 modified "2023-10-18" @default.
• W2146164067 title "Inhibition of Photosynthetic Electron Transport by UV-A Radiation Targets the Photosystem II Complex¶" @default.
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• W2146164067 doi "https://doi.org/10.1562/0031-8655(2000)072<0513:iopetb>2.0.co;2" @default.
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