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- W1987830150 abstract "The primary biochemical defect in the genetically well characterized dgd1 mutant of Arabidopsis thaliana causes a 90% reduction in the relative amount of the galactolipid digalactosyldiacylglycerol (DGDG). To study the effect of this DGDG deficiency on photosystem II (PS II), time-resolved transients of laser-flash-induced changes of the relative fluorescence quantum yield Fvar,rel(t) were measured in whole leaves from wild-type and the dgd1 mutant. The results obtained reveal (i) in untreated leaves the decay kinetics of Fvar,rel(t) reflecting reoxidation by endogenous plastoquinone are very similar in wild-type and the dgd1 mutant at room temperature, (ii) the Arrhenius plot of the temperature dependence of electron transfer from to QB exhibits a break point at about 19 °C in wild-type and about 12 °C in the dgd1 mutant, (iii) in leaves treated with DCMU the slow reoxidation of by the PS II donor side is blocked to a much higher extent in the dgd1 mutant (about 50%) compared to wild-type (about 10%), and iv) the normalized amplitude of Fvar,rel(t = 1 μs) reflecting the percentage of fast P680•+ reduction by YZ exhibits a characteristic period four oscillation in wild-type while this feature is strongly damped in the dgd1 mutant. Presumably, the severe DGDG deficiency is causing the thermal down shift of a lipid phase transition that affects the reoxidation by QB. Most strikingly, the properties of the WOC are modified as a result of reduced DGDG content. Thus, the lipid DGDG appears to be of structural relevance for the WOC." @default.
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- W1987830150 date "1997-09-01" @default.
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- W1987830150 title "Modification of the Water Oxidizing Complex in Leaves of the <i>dgd1</i> Mutant of <i>Arabidopsis thaliana</i> Deficient in the Galactolipid Digalactosyldiacylglycerol" @default.
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- W1987830150 doi "https://doi.org/10.1021/bi9709654" @default.
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