Diversity and Local Distribution of Mating Alleles in Marasmiellus praeacutus and Collybia subnuda (Basidiomycetes, Agaricales)
Murphy JF and Miller OK. 1997. Diversity and Local Distribution of Mating Alleles in Marasmiellus praeacutus and Collybia subnuda (Basidiomycetes, Agaricales). Canadian Journal of Botany. 75(1):8-17
ABSTRACT: The diversity and distribution of mating alleles in local populations of two litter decomposing mushroom species were investigated. The results from mating crosses between single-spore isolates were used to deduce mating genotypes among closely adjacent individuals. Collybia subnuda has a high mating allele diversity that is comparable to the diversity of other bipolar species. Adjacent individuals of C. subnuda did not share mating alleles, which suggests that outcrossing usually occurs in this fungus. The estimate of mating allele diversity in C. subnuda is 45, with a 95% confidence interval of 19-187. A simplified approach for designing and analyzing intercollection mating crosses for tetrapolar fungi was tested with Marasmiellus praeacutus and found useful. An unexpectedly low mating allele diversity was found in M. praeacutus, with adjacent individuals frequently sharing more than one mating allele. The pattern of shared alleles in M. praeacutus suggests the occurrence of di--mon crossing (the Buller phenomenon). We suggest that the observed low level of mating allele diversity in M. praeacutus is a consequence of limited spore dispersal, and we discuss the implications of these conclusions for population sampling in the higher fungi.
- Type
- Journal Article
- Authors
- Murphy, John; Miller, Orson
- Units
- BLRI
- Keywords
- Agaricales, APHN, Appalachian Highlands Network, Basidiomycetes, BLRI, Blue Ridge Parkway, Collybia subnuda, Fungus, Marasmiellus praeacutus, mating, population, SER, Southeast Region