SUMMARY: The quantity of glycogen that could be extracted from cultured dikaryotic mycelia of increased during the first 5 days of growth but subsequently declined. The decline coincided with the main phase of removal of carbohydrate from the culture medium, with a major reduction in the level of soluble reducing sugars of the mycelium, and with the appearance of mature sclerotia. This result complements earlier electron microscope observations that intracellular accumulations of glycogen increase during sclerotium formation and decrease during sclerotium maturation. However, extractable glycogen reserves also accumulated and then dispersed under culture conditions which did not allow sclerotium formation and in strains unable to form sclerotia. It is concluded that glycogen also serves as a transient carbohydrate store for aspects of vegetative mycelial morphogenesis other than sclerotium production.


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