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Mycoviruses.

Jillian M Myers1, Timothy Y James1

  • 1Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI 48109, USA.

Current Biology : CB
|March 1, 2022
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Summary
This summary is machine-generated.

Fungal viruses, or mycoviruses, offer potential for biocontrol by reducing pathogen growth. Further research into their biology and transmission is crucial for effective application, potentially revealing overlooked mutualistic interactions.

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Area of Science:

  • Virology
  • Mycology
  • Biotechnology

Background:

  • Fungi are hosts to a diverse range of viruses, known as mycoviruses.
  • Mycovirus research is expanding, covering genome structures, host ranges, and phenotypic impacts.
  • Mycoviruses are being explored as biocontrol agents against fungal pathogens due to their ability to reduce host growth and virulence.

Purpose of the Study:

  • To review current knowledge on mycovirus diversity, effects, and biology.
  • To address the paradox between observed virulence and theoretical predictions of mutualism in vertically transmitted mycoviruses.
  • To highlight the need for understanding mycovirus transmission and parasitism mechanisms for biocontrol applications.

Main Methods:

  • Literature review and synthesis of existing research on mycoviruses.
  • Focus on key model systems: hypoviruses of chestnut blight fungus, Sclerotinia sclerotiorum ssDNA virus SsHADV-1, and killer viruses of Saccharomyces cerevisiae.
  • Identification of knowledge gaps and future research directions.

Main Results:

  • Mycoviruses can significantly impact fungal hosts, often reducing growth and virulence.
  • Vertical transmission of most mycoviruses presents a theoretical conflict with observed parasitic traits, suggesting potential for mutualism.
  • Three well-studied mycovirus systems illustrate diverse interactions and mechanisms.

Conclusions:

  • A deeper understanding of mycovirus biology, including transmission and molecular parasitism, is essential for their use as biocontrol agents.
  • The potential for widespread mutualistic mycovirus-fungal host interactions may have been underestimated.
  • Further research is needed to fully harness mycoviruses for agricultural and environmental applications.