Phenylalanine ammonia-lyase (PAL) is distributed mainly in the peels, and activity of the enzymes decreased very obviously with the increase of fruit ripeness.

苯丙氨酸解氨酶（PAL）主要分布在果皮中，并随着果实成熟度的提高，其活性呈极显著下降趋势。感病果实的果皮中三种酶活性均比健康果皮高。

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The activity of resistance-related enzymes, such as phenylalanine ammonia-lyase (PAL), polyphenol oxidase (PPO) and peroxidase (POD) were higher than that of control.

与抗病性相关酶类的活性，如苯丙氨酸解氨酶（PAL）、多酚氧化酶（PPO）活性均高于对照。

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