Abstract
When `Granny Smith' apples were stored at different temperatures, they produced different patterns of ethylene synthesis. Accumulation of α-farnesene and conjugated trienes (CT) in peel of these fruit paralleled ethylene production. Both pre- and postharvest applications of ethephon to `Cortland' apples increased accumulation of α-farnesene and CT, whereas application of DPA suppressed ethylene production and accumulation of α-farnesene and CT. When both ethephon and DPA were applied, their respective effects were negated. In these experiments, inhibition of ethylene synthesis always reduced scald development after storage, but stimulation of ethylene did not always increase scald development Ethylene had two effects: an immediate stimulation of α-farnesene and CT accumulation which increased scald susceptibility, and also a slowly developing alteration of CT metabolism, which reduced scald susceptibility. The effect of high ethylene on scald development depended on the balance between these responses.
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