中文摘要：

从杨盘二孢菌（Marssonina brunnea）的菌丝和培养滤液中提取激发子物质，得到两种粗提物，用这两种粗提物分别处理烟草、茄子和辣椒叶片，发现均可在烟草上产生过敏性坏死斑，但不能使茄子和辣椒产生过敏性反应。用这两种粗提物分别处理抗病和感病杨树，均可以使抗病杨树的过氧化物酶活性明显升高，但感病杨树的过氧化物酶活性升高不明显。说明这两种粗提物中均含有激发子活性物质，且均为专化性激发子。

英文摘要：

Two crude elicitor fractions were extracted from mycelia of Marssonina brunnea and itscultural supernatant. The leaves of tobacoo,eggplant and capsicum were treated with the two crude elicitor fractions. Hypersensitive reactions were observed only on the tobacoo when treated with the elicitor fractions, but not on the other two plants. The changes of peroxidase activity of resistant and sensitive poplars after being treated with the two crude elicitor fractions were also studied. The results showed that the activity of peroxidase of resistant poplar was distinctly higher than that of sensitive trees. All these reveal that the two crude elicitor fractions contain elicitor active elements and these elicitors belong to special elicitors.