CARBOHYDRATE METABOLISM IN THE FUNGUS DENDRYPHIELLA SALINA

VII. THE EFFECT OF l-SORBOSE ON ETHANOL-SOLUBLE CARBOHYDRATE

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Summary

When mycelium of Dendryphiella salina Nicot & Pugh is exposed for 5 h to media containing various concentrations of the very slowly metabolized sugar, L-sorbose, the total ethanol-soluble carbohydrate content increases and there is also a stimulated synthesis of mannitol. Provided L-sorbose is absorbed, the presence of glucose, fructose, mannitol or arabitol in the medium does not prevent these changes which are different from those brought about by the non-metabolizable sugar, 3-O-methyl glucose. It is suggested that the apparent regulation of mycelial ethanol-soluble carbohydrate concentration following uptake of the latter sugar cannot be controlled primarily by turgor.

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