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Abstract: Agaricus bisporus has a unifactorial incompatibility system. Eight mating type alleles were previously found: four in the familiar bisporic and secondarily homothallic var. bisporus, and four in the tetrasporic and heterothallic var. burnettii. The latter variety was recently discovered in Sonoran Desert of California. Based on a sample of 52 sporocarps from the desert, the present study consisted of analyzing (1) allelic polymorphism at the mating type locus, and (2) the expression of the dominance of the tetrasporic trait in 79 intervarietal hybrids having the same bisporic mid-parent. Mating tests identified 14 different alleles including the eight previously known. Statistical analysis based on the mating type genotypes of 30 sporocarps indicated that the alleles had similar frequencies, and did not refute the hypothesis of random association of alleles. Estimation of the number of alleles existing in the population showed that all or most of them are already recovered. Dominance of the tetrasporic trait was generally well expressed in the intervarietal hybrids, except when one of two particular sporocarps of the desert was used as the tetrasporic parent.
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