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Chemical changes in the mycelium of the conidial Claviceps paspali mutant strain, isolated after gamma irradiation, were followed during the course of submerged fermentation and compared with the mycelial parent strain; both strains are capable of producing simple lysergic acid derivatives. The syntheses of lipids, carbohydrates, phosphates, nucleic acids, proteins, and alkaloids, as well as nutrient uptake, were determined. It was found that conidiation induced by mutagenic treatment was accompanied by a set of changes in the metabolic pattern. In the conidial mutant, the primary and secondary metabolic activities were repressed and the protein to nonprotein compound ratio of the cells was changed in favour of protein compounds.

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Metabolic pattern of mycelial Claviceps paspali seed cultures during the submerged cultivation was established. By comparing it with conidial and mycelial Claviceps purpurea strains it was found that the biosynthesis of RNA, DNA, and proteins followed a similar course in all Claviceps strains, so the fall of RNA content in mycelium may be considered a general biochemical indicator for optimally developed inoculum. But, two different patterns of carbohydrate and lipid metabolism were observed one for conidial and one for mycelial strains.