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The effect of ethrel (0.1-1.0 mM) on the development of both peroxidase activity and brown spots in 56-day old lettuce leaves was studied. The results showed that ethrel reduces both soluble and cell wall-bound peroxidase activity in lettuce leaves, the effect being independent of the incubation medium pH, the ethylene-releasing ability of ethrel therefore being not limiting. At the same time, brown...