Abstract
Abstract The activity of peroxidase in mesocarp tissue of Cucurbita maxima was rapidly increased after wounding. The increase in peroxidase activity was preceded by increased ethylene production. The induction of peroxidase activity was strongly suppressed by the application of 2,5-norbornadiene (NBD) and aminoethoxyvinylglycine (AVG) to excised discs, indicating that endogenous ethylene produced in response to wounding may have promoted the induction of peroxidase. Raised activities of 1-aminocyclopropane-1-carboxylic acid (ACC) synthase and phenylalanine ammonia-lyase (PAL) were noted prior to increased peroxidase activity. Although no significant increases in soluble phenolics, such as chlorogenic acid, were found in the wounded mesocarp tissue, lignin formation was clearly enhanced by wounding along with the increased level of ethylene production and the enhanced levels of PAL and peroxidase activities. ACC synthase and PAL induced by wounding were observed to be located predominantly in the upper and adjacent 0.5 mm of the cut surface, while peroxidase activity was found to exist deep inside the tissue.
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