Biocontrol yeasts: mechanisms and applications

Area of Science:

• Agricultural Science
• Microbiology
• Plant Pathology

Background:

• Yeasts are ubiquitous microorganisms with demonstrated antagonistic properties against plant pathogens.
• Their ease of cultivation and favorable biosafety profile make them attractive candidates for biocontrol applications.
• Existing research highlights several mechanisms by which yeasts protect plants.

Purpose of the Study:

• To review fundamental research on the mechanisms of yeast-mediated plant protection.
• To examine registered yeast biocontrol products and their underlying science.
• To identify research gaps and opportunities in yeast biocontrol.

Main Methods:

• Literature review of scientific research on yeast biocontrol mechanisms.
• Analysis of registered biocontrol products featuring yeast species.
• Synthesis of findings to assess the current state and future potential of yeast biocontrol.

Main Results:

• Key biocontrol mechanisms include competition, enzyme secretion, toxin production, volatile compounds, mycoparasitism, and induced resistance.
• Five specific yeast species (Candida oleophila, Aureobasidium pullulans, Metschnikowia fructicola, Cryptococcus albidus, Saccharomyces cerevisiae) are highlighted as registered biocontrol agents.
• A notable scarcity of fundamental studies on yeast biocontrol mechanisms and a limited number of registered products were identified.

Conclusions:

• Yeast biocontrol mechanisms are a largely unexplored research area with substantial potential for commercial development.
• Further fundamental research is needed to fully understand and exploit yeast capabilities for plant protection.
• There are significant opportunities for developing novel, yeast-based biocontrol products for sustainable agriculture.