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Inhibition of pathogenicity of the rice blast fungus by Saccharomyces cerevisiae alpha-factor
J L Beckerman1, F Naider, D J Ebbole
1Department of Plant Pathology and Microbiology, Texas A&M University, College Station, TX 77843-2132, USA.
Abstract:
Magnaporthe grisea is a fungal pathogen with two mating types, MAT1-1 and MAT1-2, that forms a specialized cell necessary for pathogenesis, the appressorium. Saccharomyces cerevisiae alpha-factor pheromone blocked appressorium formation in a mating type-specific manner and protected plants from infection by MAT1-2 strains. Experiments with alpha-factor analogs suggest that the observed activity is due to a specific interaction of alpha-factor with an M. grisea receptor. Culture filtrates of a MAT1-1 strain contained an activity that inhibited appressorium formation of mating type MAT1-2 strains. These findings provide evidence that a pheromone response pathway exists in M. grisea that can be exploited for plant protection.
Insights
The fungal pathogen Magnaporthe grisea
Area of Science:
- Plant Pathology
- Mycology
- Molecular Biology
Background:
- Magnaporthe grisea is a fungal pathogen responsible for significant crop damage.
- The fungus possesses two mating types, MAT1-1 and MAT1-2.
- Appressorium formation is a critical step in the pathogenesis of M. grisea.
Purpose of the Study:
- To investigate the role of pheromone signaling in M. grisea appressorium formation.
- To explore the potential of pheromone analogs for plant protection against M. grisea.
Main Methods:
- Treatment of M. grisea with Saccharomyces cerevisiae alpha-factor pheromone.
- Testing alpha-factor analogs for appressorium inhibition.
- Analysis of culture filtrates from M. grisea strains.
Main Results:
- S. cerevisiae alpha-factor pheromone specifically blocked appressorium formation in a mating type-dependent manner.
- Alpha-factor treatment protected plants from infection by MAT1-2 M. grisea strains.
- M. grisea MAT1-1 culture filtrates inhibited appressorium formation in MAT1-2 strains, suggesting endogenous pheromone activity.
Conclusions:
- A pheromone response pathway exists in M. grisea.
- This pathway can be targeted for developing novel strategies for plant protection against fungal diseases.
- Exploiting M. grisea's own signaling mechanisms offers a promising avenue for disease control.