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Inoculation with Nonpathogenic Fusarium solani Increases Severity of Pea Root Rot Caused by Aphanomyces euteiches
1Agriculture and Agri-Food Canada, Crops and Livestock Research Centre, Charlottetown, PE, Canada C1A 4N6.
Plant Disease
|March 2, 2019
Summary
Aphanomyces euteiches causes pea root rot. Co-inoculation with a nonpathogenic Fusarium solani isolate significantly increased disease severity, suggesting pathogen-nonpathogen interactions impact disease development.
Area of Science:
- Plant Pathology
- Agricultural Science
- Mycology
Background:
- Aphanomyces euteiches is a significant pathogen causing root rot in pea plants.
- Isolates of Fusarium solani are frequently recovered alongside A. euteiches from infested soils when using pea as a bait host.
Purpose of the Study:
- To investigate the disease symptoms and interactions between Aphanomyces euteiches and Fusarium solani in pea seedlings.
- To determine if a nonpathogenic isolate of F. solani influences disease severity caused by A. euteiches.
Main Methods:
- Pea seedlings were inoculated with A. euteiches and/or a nonpathogenic F. solani isolate.
- Disease severity was assessed, and pathogen re-isolation was performed to confirm presence.
Main Results:
- Inoculation with A. euteiches caused typical root rot symptoms.
- Inoculation with F. solani alone did not result in disease symptoms.
- Co-inoculation with A. euteiches and nonpathogenic F. solani led to significantly greater disease severity compared to A. euteiches alone (P = 0.05).
- Both A. euteiches and F. solani were successfully re-isolated from infected seedlings.
Conclusions:
- The interaction between the pea pathogen Aphanomyces euteiches and a nonpathogenic Fusarium solani isolate demonstrates a synergistic effect, enhancing disease severity.
- These findings highlight the potential impact of nonpathogenic microorganisms on the development and severity of plant diseases, even when pathogen-nonpathogen interaction mechanisms are not fully understood.
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