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In Podospora anserina, protoplasmic incompatibility due to interactions between non-allelic genes was suppressed by the effect of mutations in two modifier genes, mod-I and mod-2. It is shown that mod-I and mod-2 are involved in the production of three specific proteins, a phenoloxidase and two previously identified proteases (Bégueret &amp; Bernet 1973 a) which are associated with the phenomenon of protoplasmic disintegration. These enzymes, whose messengers are normallly latent during vegetative growth, appear at this stage of the life cycle only as a consequence of incompatible gene interactions. The mode-I and mod-2 genes and each of the five incompatibility loci involved in non-allelic incompatibility systems also participate in the formation of the protoperithecia. This pleiotropic effect suggests that protoplasmic incompatibility is a deviation in the normal physiological processes of protoperithecial formation.

The Molecular Mechanism of Protoplasmic Incompatibility and its Relationship to the Formation of Protoperithecia in Podospora anserina