Genetic Relatedness and Its Application in Selective Breeding of Agaricus brunnescens

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Abstract
Commercial (34) and research-maintained lines (162) of A. brunnescens were assigned to 27 genotypic classes on the basis of allelic variability at 5 biochemical loci. Coefficients of genetic similarity between genotypic classes were determined. Three comparisons of genetic relatedness were made to determine the best lines from which to generate homokaryons (breeding stock) for crossing. Comparisons of relatedness included mean, highest and lowest coefficients of genetic similarity between genotypic classes. A dendrogram was constructed from similarity coefficients to provide further insights into the relationships of these classes. A comprehensive and practical approach to the development of improved cultivars of the commercial mushroom by increasing variation within and among lines is discussed.