Abstract
Freshly isolated diploids of Ustilago violacea, heterozygous for mating type (a1/a2), give rise to frequent (5 x 10-3) derivative forms that appear to form after mitotic crossing-over near the mating-type locus. One such derivative, termed op-C, constitutively produces mating tubes at temperatures below 20 C on complete medium or 25 C on minimal medium but buds vegetatively at higher temperatures. Op-C strains remain diploid and have no detectable alterations, compared with the original diploid, in all the marked chromosomes except for the mating-type locus. Op-C strains yield segregants, which are either a1 in mating type (both diploids and haploids) or haploids that produce mating tubes constitutively. The op-C phenotype arises after alterations that affect the a2 allele in a1/a2 diploids and that therefore change the development of these cells. Op-C and other opaque-derivative forms provide valuable strains to study the action of the mating-type locus as a developmental master switch.
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