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Photo-generated reactive oxygen species in herbicide-treated photosystem II were investigated by spin-trapping. While the production of OH and O 2- was herbicide-independent, 1 O 2 with a phenolic was twice that with a urea herbicide. This correlates with the reported influence of these herbicides on the redox properties of the semiquinone Q A- ...
Inhibition of Photosystem II (PS II) activity induced by continuous light or by saturating single turnover flashes was investigated in Ca2+-depleted, Mn-depleted and active PS II enriched membrane fragments. While Ca2+- and Mn-depleted PS II were more damaged under continuous illumination, active PS II was more susceptible to flash-induced photoinhibition. The extent of photoinactivation as a function...
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