Abstract
The submerged culture of the Claviceps purpurea strain studied was polymorphous. In the process of alkaloid synthesis, cytodifferentiation preceded biochemical differentiation. The onset of the alkaloid phase was characterized by: predominance of chlamydospores in the culture, the presence of vegetative cells with reduced or arrested proliferation, maximum acetylCoA carboxylase activity, the maximum amount of total fatty acids, an over-average cell pool tryptophan level and minimum tryptophan synthetase activity. Intracellular ricinoleic acid was an indicator of differentiation of the culture towards alkaloid formation and also of alkaloid synthesis. The cytodifferentiation period in the initial phases of fermentation, when the cell has several alternative possibilities of development, is regarded as the most sensitive sector of the regulatory mechanisms of alkaloid formation.
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