Abstract: Five papaya varieties with different disease resistance were infected with Papaya ringspot virus, the activities of phenylalanine ammonia lyase (PAL), polyphenol oxidase (PPO) and peroxidase (POD) in papaya leaves were determined. The results indicated that the differences of the activities of PAL、PPO、POD among five papaya varieties before infected were small, and the descending order of enzyme activities was ‘Malai-10’, ‘Mihong-3’, ‘Malai-6’, ‘Malai-2’, ‘Tainong-2’. After infected, the activities of PAL、PPO、POD of five papaya varieties were higher significantly than those of their respective control, the change of enzyme activities in ‘Malai-10’ was most significant and that of ‘Tainong-2’ was slowest.

Key words: Papaya Ringspot Virus (PRSV), phenylalanine ammonia lyase, polyphenol oxidase, peroxidase, resistance

摘要： 对不同品种番木瓜接种环斑花叶病毒后,测定植株苯丙氨酸解氨酶(PAL)、多酚氧化酶(PPO)、过氧化物酶(POD)的活性变化,比较各品种的抗病性。结果表明,未接种的5个品种间PAL、PPO、POD活性差异较小,其酶活性水平次序为马来10号> 蜜红3号> 马来6号> 马来2号> 台农2号。接种后,5个品种的PAL、PPO、POD活性明显高于各对照水平,其中马来10号变化最突出,台农2号变化最缓慢。

关键词: 番木瓜环斑花叶病, 苯丙氨酸解氨酶, 多酚氧化酶, 过氧化物酶, 抗病性