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Strain 275 FI of Claviceps purpurea, which produces large amounts of peptide alkaloids in submerged culture, is a heterokaryon; after several generations on agar media, it segregates the single components. These components (by us labeled V, C, and W) are stable and produce almost no alkaloids under described conditions of submerged culture. The mycelium of strain 275 FI consists of hyphae with multinucleate cells and does not produce conidia. Strains V, C, and W form numerous anastomoses when grown together on agar. By combining strains V and C, a heterokaryon similar to 275 FI in appearance has been obtained. This new strain produces amounts of alkaloids much larger than those produced by V and C separately or in associated submerged culture. We conclude, therefore, that in strain 275 FI the heterokaryotic condition is favorable to the production of alkaloids. Several conidiaproducing cultures of C. purpurea of various origins, as well as sclerotia of the same species, have been examined. The results demonstrated that the heterokaryotic condition is rare in the cultures, but it is frequent in the mycelium from sclerotia. Since it is known that the production of alkaloids is typical of the sclerotial phase in C. purpurea, it is suggested that this capacity is related to the heterokaryosis of the producing strains.

Heterokaryosis and Alkaloid Production in Claviceps purpurea