Volume 13 Part 1 Article 4
Title: Variability of the incompatibility alleles of the tetrapolar heterothallic basidiomycete Agrocybe aegerita: A survey of recent experiments
Authors: J. Labarère, T. Noël and T.D. Ho Huynh
The variability of sexual (or homogenic) incompatibility alleles in Agrocybe aegerita occurs in two ways: a variability which affects the wild alleles in the nature, and a variability which is caused by the spontaneous appearance of new alleles in some homokaryotic strains. Alleles existing in the nature were examined in 13 wild dikaryotic strains from distinct geographic origins. The genetic analysis allowed the identification of 18 A alleles and 16 B alleles. Study of the frequencies of allele repeats allowed to predict 30 A and 25 B alleles in the wide population of A. aegerita, which represents less extensive wild allele series than in other tetrapolar basidiomycetes. On the other hand, some homokaryotic strains of A. aegerita are able to make vary spontaneously their incompatibility alleles; this event, which causes the dikaryotisation of the primary homokaryons, can be screened through pseudo-homokaiyotic fruiting. The genetic analysis of the progenies reveals the existence of new alleles at both the A and B loci which segregate with the parental alleles of the homokaryon. These new alleles behave normally (no loss of functions, self-incompatibility) and some of them have the same characteristics as wild alleles already identified. These new alleles (14 for both the A and B loci) were recovered from homokaryons deriving from three different wild strains.’Please login to download the PDF for this proceeding.