ILLEGITIMACY AND SPECIFIC FACTOR TRANSFER IN SCHIZOPHYLLUM COMMUNE

Abstract

The mechanism of illegitimate dikaryotiza-tion and specific factor transfer in Schizophyllum commune is discussed. In using an analysis method based on recombination of several biochemical mutations in nuclei in which recombination for mating type factors had occurred, 2 classes of recombinants were observed: class I, characterized by possessing some combination of nonselective markers, biochemical mutation, present only in the original dikaryon, and class II, possessing aside from mating type factors from the 2 nuclei of the original dikaryon, only genetic markers from the original homokaryon. Class II recombinants were the subject of this paper. It was shown that for class II recombinants, all 3 nuclear types present in the dikaryotic -homokaryotic mating were involved, that they possess only nonselective markers from the original homokaryon and that there is no evidence that any genetic material other than the incompatability factors was transferred to the background genome of the original homokaryon.