Abstract
Postharvest applications of polyamines reduced chilling injury of McIntosh apples and zucchini squash. McIntosh apples developed brown core, a symptom of chilling injury, after 5 months of storage at 0°C. However, this disorder was absent in fruit infiltrated with putrescine, spermidine, or spermine. Polyamine treatments also reduced softening of fruit tissue. Pressure infiltration of zucchini squash with spermine immediately after harvest reduced the severity of surface pitting during subsequent storage at 2.5°C. The elevation of spermidine and spermine levels and the augmentation of S-denosyl-methionine decarboxylase activity in squash by temperature preconditioning was also correlated with increased resistance of the squash to chilling injury.
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