不同时期叶面喷施硼酸降低了梨果石细胞含量，果实过氧化物酶、多酚氧化酶和苯丙氨酸解氨酶活性也低于对照，且幼果期处理效果最佳。
The contents of sclereid and activities of some enzymes, such as POD, PPO and PAL are decreased under the applications of H3BO3, and the effect of the application at young fruit stage is the best.
通过不同浓度和不同诱导时间两种处理方式，测定了壳低聚糖和L - C对黄瓜叶片中过氧化物酶、多酚氧化酶和苯丙氨酸解氨酶等防御酶的诱导效果。
Activities of the defense enzymes involved in POD, PPO and PAL induced by COS and L-C were measured by two different treatments of different concentrations and different induced time.
例如苯丙氨酸解氨酶（PAL）、过氧化物酶（POD）、多酚氧化酶（PPO），这些酶和植物的抗病性是密切相关的。
Such as PAL, POD , SOD and PPO , which are strongly associated with the plant disease resistance.
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