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Multiple virus infections on Heterobasidion sp.

Jarkko Hantula1, Salla Mäkelä1, Ping Xu1

  • 1Natural Resources Institute Finland, Helsinki, Finland.

Fungal Biology
|February 4, 2020
PubMed
Summary

Coinfecting viruses in Heterobasidion parviporum exhibit complex transmission dynamics and non-additive effects. Coinfection can enhance or block the effects of specific viruses like HetPV13-an1.

Keywords:
CoinfectionConifer pathogenGrowth rateMycovirusVirus transmission

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Area of Science:

  • Mycology
  • Virology
  • Forest Pathology

Background:

  • Heterobasidion viruses influence each other's transmission and host effects.
  • Understanding these interactions is crucial for managing Heterobasidion species, important forest pathogens.

Purpose of the Study:

  • To investigate the transmission patterns of multiple Heterobasidion viruses within and between species.
  • To analyze the phenotypic effects of viral coinfections on Heterobasidion growth and competitive ability.
  • To assess the stability of complex viral communities in Heterobasidion.

Main Methods:

  • Construction of Heterobasidion parviporum strains with simultaneous coinfection of five viruses.
  • Mycelial transmission experiments between same-species and inter-species cultures.
  • Analysis of Heterobasidion growth rates and competitive abilities under different viral loads.
  • Assessment of viral community stability in natural environments.

Main Results:

  • Viruses transmitted more readily between conspecific mycelia (H. parviporum) than between interspecific mycelia (H. parviporum and H. annosum).
  • Coinfection with five viruses proved unstable in natural settings.
  • Viral effects on growth and competitiveness were not additive; complex interactions were observed.
  • Coinfecting viruses may enhance transmission of HetPV13-an1 while potentially blocking its detrimental effects.

Conclusions:

  • Viral transmission dynamics in Heterobasidion are species-specific.
  • Complex viral communities in Heterobasidion are unstable and exhibit non-additive interactions.
  • Coinfection strategies could be leveraged to modulate the efficacy of viral biocontrol agents like HetPV13-an1.