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Micro- and macrospatial scale analyses illustrates mixed mating strategies and extensive geneflow in populations of

Guillermo Pérez1, Bernard Slippers, Brenda D Wingfield

  • 1Department of Microbiology and Plant Pathology, University of Pretoria, Pretoria, South Africa. guillermo.perez@fabi.up.ac.za

Molecular Ecology
|June 10, 2010
PubMed

Insights

This study reveals the Eucalyptus leaf fungus Teratosphaeria nubilosa uses a mixed mating strategy. Selfing dominates, but outcrossing boosts genetic diversity, complicating resistance breeding efforts.

Area of Science:

  • Mycology
  • Evolutionary Biology
  • Plant Pathology

Background:

  • Fungal sexual reproduction involves selfing or outcrossing.
  • Invasive pathogens pose significant threats to agriculture and ecosystems.
  • Understanding pathogen mating systems is crucial for disease management.

Purpose of the Study:

  • Investigate the reproductive strategies of the invasive Eucalyptus leaf pathogen Teratosphaeria nubilosa.
  • Determine the roles of selfing and outcrossing in its genetic diversity.
  • Assess the implications for disease resistance strategies.

Main Methods:

  • Analysis of genetic diversity at micro and macrospatial scales.
  • Quantification of selfing and outcrossing contributions to genotypic diversity.
  • Population genetic structure analysis.

Main Results:

  • Teratosphaeria nubilosa exhibits a mixed mating strategy.
  • Selfing is the predominant mating strategy at microspatial scales.
  • Outcrossing events contribute to genotypic diversity at macrospatial scales.
  • High gene flow across large distances ensures even distribution of diversity.

Conclusions:

  • The mixed mating system, combined with high gene flow, creates widespread genetic diversity.
  • This diversity makes breeding for resistance against Teratosphaeria nubilosa challenging.
  • Introduction of multiple genotypes of such pathogens poses a significant evolutionary risk.

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