Abstract
l -Sorbose and 3- O -methyl glucose reduce colony diameter and increase the amount of hyphal branching in Dendryphiella salina but have only a small effect on dry weight produced in shake culture. The effect of l -sorbose on colony morphology can be prevented by glucose but not by less readily metabolized carbohydrates. Theophylline and phaseollin act like l -sorbose and 3- O -methyl glucose and there is a synergistic effect between theophylline and the two sugars. Imidazole, cycloheximide and Dio-9 reduce colony diameter but show no paramorphogenic effects. The results are discussed in terms of the removal of glucose repression by cAMP.
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