Summary: In the tetrapolar basidiomycete a mutation in the factor impairs the vegetative growth of the hyphae. An ultrastructural study of the hyphae revealed an increased number of vacuoles in the subapical cells and defects in mitochondria in both apical and subapical cells. The ATP concentration in the hyphae and the specific activity of soluble inorganic pyrophosphatase (EC were also observed to be decreased. These changes were interpreted as the result of non-specific hydrolytic activity caused by the mutation in the factor and originating in the cytoplasm but also affecting the mitochondria. The morphological and biochemical changes recorded in the mutant hyphae are comparable with those at the beginning of the mating of compatible homokaryons. At that time the breakdown of the cell components may be necessary to abolish the existing homokaryotic information and to control the direction of nuclear migration.


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