利用杨树溃疡菌(Dothiorella gregaria)培养滤液和菌丝体提取物诱导处理不同抗病性的杨树愈伤组织,结果发现经诱导处理后愈伤组织的过氧化物酶、多酚氧化酶和苯丙氨酸解氨酶活性在一定时期内均明显升高,且抗病品种毛白杨的3种酶活性升高的幅度大,维持的时间也较长。这表明溃疡菌的代谢产物和菌丝体提取物可作为诱导剂来诱导杨树的抗病性。 Using the culture filtrate and mycelium extract of Dothiorella gregaria to induce the callus of poplar with different disease resistance, we found that the callus’s peroxidase, polyphenol oxidase and phenylpropionate Ammonia-lyase activity in a certain period of time were significantly increased, and disease-resistant varieties of Populus tomentosa three kinds of enzyme activity increased by a large extent, to maintain a longer time. This indicates that the metabolites of canker bacteria and mycelium extracts act as inducers to induce disease resistance in poplars.