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松针褐斑病（Ｌｅｃａｎｏｓｔｉｃｔａａｃｉｃｏｌａ）是湿地松（Ｐｉｎｕｓｅｌｌｉｏｔｔｉｉ）上的重要病害。分析湿地松的９个抗病无性系和４个易感株２年生针叶中过氧化物酶和多酚氧化酶的活性。结果表明湿地松针叶中过氧化物酶活性很高，多酚氧化酶活性相对较弱．而且抗病植株的过氧化物酶和多酚氧化酶活性都明显高于感病植株。过氧化物酶活性与多酚氧化酶活性之间里明显正相关，相关系数０．９。湿地松的１年生针叶中多酚氧化酶和过氧化物酶活性都非常低，而且在抗病与感病针叶间酶活性无明显差别。用病原菌毒素初提液处理针对可使抗病和感病植株的过氧化物酶活性都明显提高，而且易感株的上升幅度比抗病株高。相反。多酚氧化酶活性在用毒素处理后都表现下降，而且抗病株的降幅比易是株大。
Lecanosticta icicola is a major disease on Pinus iliattii. The activities of peroxidase and polyphenol oxidase in 2-year-old needles of 9 disease-resistant clones and 4 susceptible strains of Pinus elliottii were analyzed. The results showed that the pine needles in the peroxidase activity is high, polyphenol oxidase activity is relatively weak. Moreover, the activities of peroxidase and polyphenol oxidase of resistant plants were significantly higher than that of susceptible plants. There was a significant positive correlation between peroxidase activity and polyphenol oxidase activity with a correlation coefficient of 0.9. The activities of polyphenol oxidase and peroxidase in one-year-old needles of P. elliottii were very low, and there was no significant difference in enzyme activities between conifers and susceptible needles. With the initial extract of pathogenic toxins can be resistant to disease and susceptible plants were significantly increased peroxidase activity, and susceptible strains increased rate of disease-resistant plant height. in contrast. Polyphenol oxidase activity decreased after treatment with toxins, and the decline of resistant strains is easy to plant.