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Oleic Acid and Linoleic Acid Enhances the Biocontrol Potential of Metarhizium rileyi

Guang Wang1, Xu Zhang1, Guangzu Du1

  • 1Yunnan State Key Laboratory of Conservation and Utilization of Biological Resources, College of Plant Protection, Yunnan Agricultural University, Kunming 650201, China.

Journal of Fungi (Basel, Switzerland)
|August 28, 2024
PubMed

Insights

Oleic and linoleic acids boost the biocontrol fungus Metarhizium rileyi. These lipids enhance fungal growth, stress tolerance, and pest-killing speed, improving its potential as a biopesticide.

Area of Science:

  • Agricultural Science
  • Mycology
  • Biotechnology

Background:

  • Metarhizium rileyi is a widespread insect pathogenic fungus with biocontrol potential against pests like noctuid insects.
  • Its application is limited by slow growth, abiotic stress sensitivity, and slow pest kill speed compared to other entomopathogenic fungi.

Purpose of the Study:

  • To investigate the effects of different lipids on Metarhizium rileyi growth, development, and virulence.
  • To explore the mechanistic basis for lipid-mediated improvements in M. rileyi efficacy.

Main Methods:

  • Screening of eight lipid types for their impact on M. rileyi.
  • Assessing M. rileyi growth, stress tolerance, and virulence.
  • Investigating effects on conidial germination, appressorium formation, and cuticle degradation.
  • Analyzing gene expression related to growth, development, and enzyme activity.

Main Results:

  • Oleic acid and linoleic acid significantly promoted M. rileyi growth and development.
  • These lipids enhanced stress tolerance and virulence of M. rileyi.
  • Exogenous oleic and linoleic acids improved conidial germination, appressorium formation, and cuticle degradation, linked to upregulated gene expression.

Conclusions:

  • Oleic acid and linoleic acid enhance the stress tolerance and virulence of Metarhizium rileyi.
  • These lipids improve fungal efficacy by protecting conidial germination and promoting cuticle infection.
  • Findings offer insights for developing improved Metarhizium rileyi-based biopesticides.
Keywords:
developmentgrowthstress tolerancesvirulence

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