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.
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。
Phenylalanine ammonia-lyase (PAL) is distributed mainly in the peels, and activity of the enzymes decreased very obviously with the increase of fruit ripeness.
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。
The activity of resistance-related enzymes, such as phenylalanine ammonia-lyase (PAL), polyphenol oxidase (PPO) and peroxidase (POD) were higher than that of control.
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.
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;
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;
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