杉木炭疽病与针叶中几种生化物质之间的关系

在同一生态环境中，历年发病与不发病的杉木群体间针叶生化物质量值存在着差异。不发病的健康杉木具有低的过氧化物酶活性和比活性、低的Ｎ、Ｐ含量及高的Ｋ和纤维素含素。炭疽病菌侵入当年新梢在发病盛期不发病，可能此时正值新梢生长盛期，寄主抗病性强之故。翌年，历年病株先年秋梢顶端表现出炭疽病症状，与还原糖含量高有利于病菌打破潜伏浸染状态，且由于该部位针叶维生素含量低也有利于病菌扩展从而导致寄主发病。随着病害的发

A STUDY ON THE BIOCHEMICAL SUBSTANCES IN CHINESE-FIR RELATED TO ANTHRACNOSE

Tn the same environmental conditions, there exist differences in quantities of biological sub stances in needles between Chinese-fir (Cunninghamia lanceolata) trees appearing anthracnose symptom in recent years and not doing ones. The trees without symptom have lower activity and specific activity of peroxidase, owler contents of N, P and higher contens of K and cellulose than the trees appearing symptom. New shoots do not appear symptom in the current year although the needles were infected by the causal fungus. The shoots that developed in the last autumn appear symptom in spring, it may be related to higher reducing sugars content in the needles which is favorable to the causal fungus to break the condition of latent infection, and related to lower cellulose content in the needles which is favorable to the spread of the causal fungus. As the disease developes, the metabolism of the host may be confused due to the changes of the activity and specific activity of peroxidase, the contents of protein, water, N,P,K and carbohydrates in the diseased needles.