• We are sorry, but NCBI web applications do not support your browser and may not function properly. More information
Logo of geneticsGeneticsCurrent IssueInformation for AuthorsEditorial BoardSubscribeSubmit a Manuscript
Genetics. Oct 1996; 144(2): 557–567.
PMCID: PMC1207550

Female Fertility and Mating Type Effects on Effective Population Size and Evolution in Filamentous Fungi

Abstract

The idealized individual in many fungal species is a haploid self-sterile hermaphrodite that may be propagated by asexually produced spores or that may reproduce sexually. In field populations, polymorphism occurs for female-sterile/hermaphrodite status, and female-sterile mutants, which function only as males during sexual reproduction, may comprise >50% of the population. The effective population number may be based on the number of strains of different mating type or the relative frequency of hermaphrodites. The female-sterile mutants are at a selective disadvantage every time sexual reproduction occurs, and must have an advantage during vegetative propagation to persist at a significant frequency. When a high frequency of female-sterile strains is observed in field populations, it indicates that vegetative propagation is a significant component of the fungus' natural history. Depending on the mutation rate to female sterility and the selective advantage of the female-sterile strains during vegetative propagation, the ratio of sexual:asexual generations can range from 1:15 to 1:2300 for species in the Gibberella fujikuroi complex. The relative rarity of sexual reproduction may permit female-sterile strains to accumulate to a level such that local populations could completely lose sexuality and appear as asexual (imperfect) species.

Full Text

The Full Text of this article is available as a PDF (1.1M).

Selected References

These references are in PubMed. This may not be the complete list of references from this article.
  • Burt A, Carter DA, Koenig GL, White TJ, Taylor JW. Molecular markers reveal cryptic sex in the human pathogen Coccidioides immitis. Proc Natl Acad Sci U S A. 1996 Jan 23;93(2):770–773. [PMC free article] [PubMed]
  • Geiser DM, Arnold ML, Timberlake WE. Sexual origins of British Aspergillus nidulans isolates. Proc Natl Acad Sci U S A. 1994 Mar 15;91(6):2349–2352. [PMC free article] [PubMed]
  • Leslie JF, Raju NB. Recessive mutations from natural populations of Neurospora crassa that are expressed in the sexual diplophase. Genetics. 1985 Dec;111(4):759–777. [PMC free article] [PubMed]
  • Smith JM, Smith NH, O'Rourke M, Spratt BG. How clonal are bacteria? Proc Natl Acad Sci U S A. 1993 May 15;90(10):4384–4388. [PMC free article] [PubMed]
  • Moya A, Galiana A, Ayala FJ. Founder-effect speciation theory: failure of experimental corroboration. Proc Natl Acad Sci U S A. 1995 Apr 25;92(9):3983–3986. [PMC free article] [PubMed]
  • Nauta MJ, Hoekstra RF. Evolution of reproductive systems in filamentous ascomycetes. II. Evolution of hermaphroditism and other reproductive strategies. Heredity (Edinb) 1992 Jun;68(Pt 6):537–546. [PubMed]
  • Nelson MA. Mating systems in ascomycetes: a romp in the sac. Trends Genet. 1996 Feb;12(2):69–74. [PubMed]
  • Wright S. Evolution in Mendelian Populations. Genetics. 1931 Mar;16(2):97–159. [PMC free article] [PubMed]
  • Xu JR, Leslie JF. A genetic map of Gibberella fujikuroi mating population A (Fusarium moniliforme). Genetics. 1996 May;143(1):175–189. [PMC free article] [PubMed]

Articles from Genetics are provided here courtesy of Genetics Society of America

Formats:

Related citations in PubMed

See reviews...See all...

Cited by other articles in PMC

See all...

Links

Recent Activity

Your browsing activity is empty.

Activity recording is turned off.

Turn recording back on

See more...