SUMMARY: Observations on have confirmed that bursting of hyphal apices is brought about by an excessive water potential gradient across the hyphal membrane. Low concentrations of the non-metabolizable sugars 3--methyl-glucose and -sorbose are much more effective than metabolizable sugars in producing bursting. However, at high concentrations they have a protective effect by reducing the water potential gradient. These observations allow a reinterpretation of sugar transport kinetic data which suggested that the glucose transport system in filamentous fungi can exist in two states dependent on the repressive effect of glucose.


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