Abstract
The production of cercosporin, a pigment of the leaf spot pathogen of sugar beet, Cercospora beticola Sacc. was induced by blue light. Cercosporin photo-induction was oxygen and carbon dioxide dependent. The results suggest that cercosporin production is a biphasic phenomenon, the initial carbon-dioxide sensitive, light-independent steps representing the accumulation of intermediates which are then converted to cercosporin by light-dependent, carbon-dioxide insensitive steps. Those results, along with action spectral evidence, isolation of a pigment-protein complex and indications of cercosporin involvement in terminal respiration suggest the possibility that quinones may fulfil the role of photoreceptor compounds in this organism.
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