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Evolutionary dynamics of spore killers

M J Nauta1, R F Hoekstra

  • 1Department of Genetics, Agricultural University, Wageningen, The Netherlands.

Genetics
|November 1, 1993
PubMed
Summary
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Spore killing in ascomycetes, a form of segregation distortion, requires additional advantages for killer genotypes to invade and persist. Stable populations need killer, sensitive, and resistant fungal types.

Area of Science:

  • Evolutionary biology
  • Population genetics
  • Mycology

Background:

  • Spore killing in ascomycetes is a unique segregation distortion.
  • It results in asci with half the normal number of surviving spores, all of the killer type.

Purpose of the Study:

  • To explore conditions for the invasion of spore killers.
  • To understand the stable polymorphism of killer, sensitive, and resistant fungal genotypes in natural populations.

Main Methods:

  • Population genetic modeling was employed.
  • The models analyzed invasion dynamics and stable coexistence of different genotypes.

Main Results:

  • A population with only killer and sensitive genotypes is unstable.

Related Experiment Videos

  • Stable invasion and polymorphism of spore killers require additional advantages for killer genotypes.

    • Conclusions:

    • Additional advantages, such as local sibling competition or heterozygous advantage, are necessary for stable spore killer polymorphism.
    • Spore killing differs from other segregation distortion forms, necessitating further field data.