1887

Abstract

Microcycle conidiation in shaken cultures of M 79 was induced at 24°C without any shock treatment. The occurrence of a microcycle depended on the presence of an organic acid (especially glutamic acid) in combination with glucose, low phosphate concentration, light and sufficient aeration. Absence of glucose and/or lowered aeration evoked vegetative growth. A synchronous and homogeneous microcycle required a certain relationship between the number of inoculated conidia and the concentration of the organic acid in the medium; the optimum was at 0·08 nmol acid per conidium. Higher values stimulated normal vegetative growth. A shortage or absence of the organic acid led to an atypical growth. The effect of organic acid can be partially replaced by addition of 2% (w/v) CaCO. Addition of NH in concentrations higher than 6 m to cultures with glutamate or glutamine evoked vegetative growth.

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1988-10-01
2022-01-26
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