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The Journal of Heredity 1985:76(5):348-354
© 1985 The American Genetic Association 76:348-354

research-article

Mapping genes by meiotic and UV-induced mitotic recombination in Coprinus cinereus

J. D. Amirkhanian, and J. W. Cowan

The authors are, respectively, research associate in the Botany Section of the Los Angeles County Museum of Natural History; and senior lecturer in the Department of Plant Sciences, University of London King's College, London. Please address reprint requests to Dr. Amirkhanian: 900 Exposition Blvd., Los Angeles, CA 90007.

Abstract

Three morphological mutants in Coprinus cinereus—one spontaneous (den-2) and two chemically induced (zigand sta)—were assigned to linkage groups and utilized in meiotic and mitotic mapping. Mutants den-2 and zig belong to linkage group III, den-2 being close to the centromere and about 20 map units (mu) from zig. The mutant sta in linkage group ‘G’ is at a distance of about 37 mu from ade-3. Mitotic mapping confirmed the gene order in linkage group III and provided evidence that trp-2 in linkage group ‘G’ was between the centromere and ade-3. These morphological mutants are compact in colony growth and therefore suited to high-density plating. The rarity of spontaneously occurring mitotic segregants suggests that diploids of Coprinus cinereus, heterozygous for morphoiogical markers in repuision, could serve as useful test systems for rapid screening of chemical mutagen/carcinogens via mitotic recombination studies.


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