若干种化合物钝化交链孢酸的研究

THE STUDY ON SOME COMPOUNDS INACTIVATING ALTERNARIC ACID

作者分离并提纯了马铃薯和番茄早疫病菌(Alternaria solani)的致病因子交链孢酸。在查明对番茄具有致病性的基础上,研究了多种化合物对交链孢酸的钝化作用。结果表明,供试的氨基酸对交链孢酸的植物毒性没有影响,而K_2HPO_4、KH_2PO_4、KMnO_4、FeSO_4、MnSO_4和柠檬酸铁等化合物均能减轻其植物毒性。这些化合物对A.solani的孢子萌发及菌丝生长没有影响,却能特异性地钝化交链孢酸。这种钝化作用与浓度有关,浓度愈高,钝化作用愈强烈。各种钝化物对番茄早疫病在离体叶片及植株上的防治效果分别为55.7％～75.1％和55.3％～65.8％。

Alternaric acid, a pathogenic factor of early blight disease of potato and tomato, has been isolated and purified. After proved its phytotoxicity to tomato, we studied some compounds inactivating it. The results showed that the tested amino acids had no effect on phytotoxicity of alternaric acid, otherwise, K2HPO4,KH2PO4,KMnO4, FeSO4,FeCl3,MnSO4 and ferric citrate can reduce its phytotoxicity. These compounds have no effect on spores germination and hyphae growth of Alternaria solani ,but they can specifically inactivate alteraric acid,and the inactivation has relation to its concentration, the higher its concentration, the stronger its inactivation. The control effects of the compounds on early blight disease of tomato were 55. 7% - 75. 1% and 55. 3% -65. 8% on detached leaves and plants,respectively.