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Species borderlines in Fusarium exemplified by F. circinatum/F. subglutinans

Liang Zhao1, Sybren de Hoog2, Ferry Hagen3

  • 1Key Laboratory of Environmental Pollution Monitoring/Disease Control, Ministry of Education & Guizhou Talent Base of Microbes and Human Health, School of Basic Medicine, Guizhou Medical University, Guiyang 550025, PR China; Westerdijk Fungal Biodiversity Institute, Utrecht, the Netherlands.

Fungal Genetics and Biology : FG & B
|August 16, 2019
PubMed

Insights

Genetic exchange occurs between Fusarium species, impacting plant and animal health. This study reveals that closely related Fusarium strains can recombine or undergo homothallic fruiting, blurring species boundaries.

Area of Science:

  • Mycology
  • Plant Pathology
  • Animal Pathology

Background:

  • Fusarium species are significant cross-kingdom pathogens affecting both plants and animals.
  • The ecological plasticity of Fusarium challenges traditional species concepts for closely related lineages.
  • Understanding genetic interactions is crucial for managing Fusarium infections.

Purpose of the Study:

  • To investigate genetic interactions between two closely related Fusarium species, F. circinatum and F. subglutinans.
  • To characterize the outcomes of interspecific crosses, including recombination and homothallic fruiting.
  • To explore the implications of these interactions for Fusarium species delineation.

Main Methods:

  • Sequencing of translation elongation factor 1α (TEF1) and RNA polymerase subunit RPB2.
  • Performing sexual crosses between F. circinatum and F. subglutinans strains.
  • Assessing vegetative compatibility groups (VCGs) to understand genetic relatedness.

Main Results:

  • Successful interspecific crosses yielded recombination or homothallic fruiting, primarily in F. subglutinans.
  • Crossings were skewed, with F. circinatum exhibiting higher recombination rates than F. subglutinans.
  • Evidence suggests genetic exchange is regulated, occurring more frequently between phylogenetically close partners.

Conclusions:

  • Genetic exchange in Fusarium is a regulated process with multiple mechanisms.
  • Phylogenetic proximity facilitates genetic exchange, leading to fluid species boundaries in Fusarium.
  • These findings contribute to a refined understanding of Fusarium species diversity and evolution.
Keywords:
Biological species conceptFusarium circinatumFusarium subglutinansRPB2RecombinationTEF1

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