Inheritance of Isozyme Mobility Differences between Two Races of the Head Smut of Grasses, Ustilago bullata Berk

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Abstract
A cross between 2 races of U. bullata with electrophoretic differences for 6 enzymes showed that 5 differences were due to allelic variation at a single locus. The high degree of inviability of primary sporidia from hybrid teliospores and the complete linkage of 2 loci suggests that the 2 races also differ in chromosomal rearrangements. The genetic constitution of surviving progeny varied greatly. Some were possibly haploid at all enzyme loci and for mating type; some were apparently heterozygous for all loci; and some were heterozygous for only a few loci. Electrophoretic data is useful in the study of interracial crosses and the need for genetic analyses of electrophoretic variation in fungi.