用杨树溃疡病菌感染具有不同抗病性的杨树栽培种的愈伤组织,然后在一定的时间间隔上分期取样,测定各栽培种的过氧化物酶和多酚氧化酶的活性。结果表明:各栽培种受病原菌感染后过氧化物酶和多酚氧化酶活性都有升高,但抗病品种两种酶活性的变化在时间上先于感病品种,在变化的幅度上大于感病品种。品种的抗病性与这两种酶活性呈正相关。 Poplar cultivars with different disease resistances were infected with poplar canker and then staged at regular time intervals to determine peroxidase and polyphenol oxidase activities of the cultivars. The results showed that the activities of peroxidase and polyphenol oxidase in all cultivars were all increased after infection by pathogenic bacteria, but the changes of the activities of the two enzymes in resistant cultivars were earlier than the susceptible ones in time, Sick variety. The disease resistance of cultivars was positively correlated with the activity of these two enzymes.