Ethane Formation and Chlorophyll Bleaching in DCMU-Treated Euglena gracilis Cells and Isolated Spinach Chloroplast Lamellae

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Abstract
Light dependent chlorophyll bleaching and ethane formation in Euglena gracilis cells at slightly acidic pH values above 5.2 are enhanced by DCMU and other photosystem II blockers. Excited chlorophyll under conditions of limited energy dissipation seems to be the oxidant for ω-3 unsaturated fatty acids, yielding ethane and other (ethylene, “malondialdehyde”) oxidation products, cooxidizing chlorophyll.