关键词: 胶孢炭疽菌菟丝子专化型, 大豆菟丝子, 致病率, 毒素

Abstract: Colletotrichum gloeosporioides(Penz.) Sacc. f. sp. cuscutae Chang could produce pathogenic exo toxins. The toxins elicite stem lesions on Cuscuta spp. which are similar to those by the conidia of the strain. Cuscuta sucrose broth, improved Czapek-Dox broth and liquid fermentation medium are all fit for toxin production. The pathogenic rate of crude toxin liquid remaine stable to a high degree after heated at 100 ℃ for 30 min, but get rather lower than the control after hydrolysed by 5 mol/L HCl for 4 h. The crude toxins show remarkable stability to pH values, difficult to be dissolved in many organic solvents. The results of dialyzation show that the toxins are a kind of large moleculars. It is conjectured that the main toxicity components are polysaccharides.

Key words: Colletotrichum gloeosporioides(Penz.) Sacc. f. sp. cuscutae Chang, Cuscuta spp., PATHOGENIC RATE, TOXIN