CERCOSPORIN, A PHOTOSENSITIZING TOXIN FROM CERCOSPORA SPECIES
CERCOSPORIN, A PHOTOSENSITIZING TOXIN FROM CERCOSPORA SPECIES
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DOI：
10.1094/phyto-72-370
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发表时间：
1982-01-01
期刊：
影响因子：
3.2
通讯作者：
DAUB, ME
中科院分区：
文献类型：
--
作者：
DAUB, ME
Cercosporin是一种由Cercospora属的成员产生的非特异性毒素，在结构上与光敏化合物金丝桃素有关。从甜菜青霉和烟草青霉的培养物中分离出尾孢菌素，并对烟草悬浮培养细胞进行了毒性试验。尾孢菌素只有在光照下孵育时才对烟草细胞有毒性。杀灭反应的作用光谱与头孢菌素的吸收光谱一致。Dabco和Bisin是两种猝灭单线态O的化合物，它们延缓了头孢菌素对细胞的杀伤。因此，尾孢菌素在寄主植物中扮演着光敏剂的角色。讨论了光敏化合物在植物病害中的可能作用。
Cercosporin, a nonspecific toxin produced by members of the genus Cercospora, is structurally related to the photosensitizing compound hypericin. Cercosporin was isolated from cultures of C. beticola and C. nicotianae and tested for toxic effects on suspension-cultured cells of tobacco. Cercosporin was toxic to tobacco cells only when they were incubated in the light. The action spectrum of the killing response agreed with the absorption spectrum of cercosporin. Dabco and bixin, 2 compounds that quench singlet O, delayed killing of cells by cercosporin. Cercosporin is thus acting as a photosensitizing agent in host plants. The possible role of photosensitizing compounds in plant diseases is discussed.