Abstract
Specific activities for alcohol dehydrogenase (ADH) are higher in dark-grown than in light-grown cultures of the fungus Phycomyces blakesleeanus. A single electrophoretic band with ADH activity was detected in P. blakesleeanus; this electromorph stained for ADH activity more intensely in dark-grown mycelia than in light-grown mycelia. A protein band, with the same electrophoretic mobility as this unique ADH electromorph, stained more darkly in extracts from unilluminated mycelia than from illuminated mycelia. The light-dependent decrease of ADH activity was normal in five Phycomyces mutants with altered phototropism ( mad genotype). Since two of these strains carry multiple mutations and show extremely reduced phototropism even at light intensities higher than the light intensity used in this work, it is concluded that the light-dependent ADH decrease is not mediated by the mad photosystem.
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