Physiology of the Incompatibility Factors in Schizophyllum commune

Abstract

1. A standard system of nomenclature is used and is recommended for general adoption. This system proposes the following terms: monokaryon, the monosporous containing only a single type of nucleus; dikaryon, the secondary mycelium containing conjugate nuclei; A and B, specifically identified by superscripts, incompatibility factors at the two loci; di-mon matings, matings involving diploidization of a monokaryon by a dikaryon. 2. Four distinct types of reaction are obtained in matings between monokaryons of any stock. These reactions depend on the identity or difference of the alleles at each locus, thus: A1B1 x A2B2-dikaryon A1B1 x A1B1-overlap A1B1 x A2B1-barrage A1B1 x A1B2-flat 3. Flat, and, in some instances, barrage, can be subcultured. Each exhibits a dual mating type, diploidizing the two types of monokaryon that their parental mycelia diploidize. From this and other observations it is concluded that flat and barrage are heterokaryons. Only a minority of the cells of flat,...