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- W2006660828 abstract "The competition between various herbicides and plastoquinone, at the QB site of Photosystem II, has been studied by measuring absorption changes between 300 and 360 nm in spinach and chenopod chloroplasts, in response to a train of saturating short xenon flashes. A complex pattern was observable without addition of chemicals interfering with electron flow. The effect of potassium ferricyanide, of hydroxylamine and of valinomycine-K+ permitted to simplify the pattern and, in particular, to observe binary oscillations with flash number, attributable to the functioning of the two-electron gate QB. Herbicides belonging to different classes block electron transfer when added at high concentration. At low concentration, however, inverted binary oscillations become observable. When the chloroplasts have been first oxidized with ferricyanide, this behaviour develops progressively in response to illumination. Varying the herbicide concentration, it appears that the concentration inducing maximum binary oscillations correlates with inhibition of linear electron transfer, within each class of herbicides. Phenolic herbicides induce the largest oscillations and ureas the smallest. The binary oscillations have the spectrum of the plastoquinone anion. The results clearly show that the studied herbicides compete efficiently with QB, but not with Q−B, at the QB binding site. Atrazine-resistant chenopod chloroplasts still display normal binary oscillations in the absence of herbicide, or in the presence of atrazine alone. They are highly sensitive to DCMU and to i-dinoseb, but no inverted binary oscillations could be observed with these herbicides." @default.
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- W2006660828 title "Effects of herbicides on binary oscillations of ultraviolet flash-induced absorption changes in chloroplasts" @default.
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- W2006660828 doi "https://doi.org/10.1016/0005-2728(85)90032-5" @default.
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