The Genetic Structure of the Incompatibility Factors of Schizophyllum Commune: The a-Factor

Linkage to the incompatibility factors and maintenance of genetic variation in selection lines of Schizophyllum commune

“…If, as suggested by Simchen (1966), the L genotypes are particularly sensitive to environmental effects in the early stages of growth, which persist during later development, this would give rise to pseudo-genetic variation. The A and B mating type factors are each composed of two loci Aoc,48; and Boc, B/3 (Raper et al, 1958(Raper et al, , 1960Koltin, et al 1967).…”

Genetic control of recombination in Schizophyllum commune: the occurrence and significance of natural variation

“…Distribution of alleles in nature. Surveys of recombination in the A factor and in the B factor, in a large number of wild-type strains taken from a worldwide sample, have been made by Raper and associates (Raper, Baxter and Ellingboe, 1960;Koltin, Raper and Simchen, 1967). The main purpose of these surveys was to establish the allelic constitution of the native A factors and B factors, but in addition they can be used to obtain information on the range and distribution of the recombination-control systems in nature.…”

“…Thirty-four wild-type strains were each crossed to a single common strain (699); the frequency of recombination in the A factor was determined for each cross after meiosis at 330 C. (Raper, Baxter and Ellingboe, 1960). (Actually thirty-eight crosses were made; four are excluded from the present analysis either because the meiotic temperature varied from 33° C. or because the strains had a common allele and hence recombinants could not be detected.)…”

Ultrastructure of an Indigotin-producing Dome Mutant of Schizophyllum commune

“…In this study the pigment production appears to be closely linked with the morphological dome mutation, which is known to map close to streak (Raper et al, 1960). Although non-dome strains can be induced to produce small amounts of the pigment, the dome strains always produce large quantities under suitable conditions.…”

“…The two mutations are those leading to the production of a blue, waterinsoluble pigment (indigotin) (Miles, Lund & Raper, 1956) and to a non-spreading colonial morphology (dome) (Raper, Baxter & Ellingboe, 1960). The production of the blue pigment was first recorded by Papazian (1950) and it was identified by Miles et al (1956).…”