Department of Crop and Soil Sciences, Michigan State University, East Lansing, Michigan 48824.
Plant Physiol. 1982 Jun;69(6):1361-4. doi: 10.1104/pp.69.6.1361.
Cercosporin, a nonspecific toxin from Cercospora species, is a photosensitizing compound which rapidly kills plant cells in the light. Cell death appears to be due to a cercosporin-mediated peroxidation of membrane lipids. Tobacco leaf discs treated with cercosporin showed a large increase in electrolyte leakage 1 to 2 minutes after irradiation with light. All tobacco protoplasts exposed to cercosporin in the light were damaged within 45 minutes. Chloroform:methanol extracts of toxin-treated suspension cultures gave positive reactions for lipid hydroperoxides in the thiobarbituric acid test. Cercosporin-treated leaf discs emitted high concentrations of ethane 12 to 24 hours after incubation in the light. Cercosporin also oxidized solutions of methyl linolenate as determined by the thiobarbituric acid assay and the emission of ethane. alpha-Tocopherol had an inhibitory effect on the cercosporin-mediated lipid peroxidation.
尾孢菌素，一种来自尾孢菌属的非特异性毒素，是一种光敏化合物，可在光照下迅速杀死植物细胞。细胞死亡似乎是由于尾孢菌素介导的膜脂过氧化作用所致。用尾孢菌素处理的烟草叶片圆片在光照下照射 1 至 2 分钟后，电解质泄漏大量增加。所有在光照下暴露于尾孢菌素的烟草原生质体在 45 分钟内受到损伤。用毒素处理的悬浮培养物的氯仿：甲醇提取物在硫代巴比妥酸试验中对脂质过氧化物呈阳性反应。用尾孢菌素处理的叶片圆片在光照下孵育 12 至 24 小时后，会发出高浓度的乙烷。如硫代巴比妥酸测定法和乙烷的排放所表明的那样，尾孢菌素还氧化了亚甲基亚麻酸的溶液。α-生育酚对尾孢菌素介导的脂质过氧化有抑制作用。
