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Quantum yield of PSII electron transport of the mutant bas-23 (○) and control line 702-3 (•) after feeding lincomycin for 4 and 8 h. Chlorophyll a fluorescence was measured in dark-adapted 8-d-old plants grown on soil. A 30-min illumination period (white bars) was followed by a 30-min dark period (black bars).
