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.
结果表明，喷施水杨酸抑制了过氧化物酶（POD）、多酚氧化酶（PPO）、苯丙氨酸解氨酶（PAL）活性，降低了石细胞的大小、密度和含量。
The results showed that POD, PPO and PAL activities were inhibited and the stone cell density , diameter and contents were decreased in the treatment of SA spraying;
苯丙氨酸解氨酶的株间差异相对较小，但在总体水平上，抗病无性系的酶活性和比活性也比易感株略高。
Phenylalanine ammonia lyase activities of the resistant clone needles, in general, were also a bit higher than those of susceptible individuals.
苯丙氨酸解氨酶的株间差异相对较小，但在总体水平上，抗病无性系的酶活性和比活性也比易感株略高。
Phenylalanine ammonia lyase activities of the resistant clone needles, in general, were also a bit higher than those of susceptible individuals.
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