Outbreak Risk of Club Root Caused by Plasmodiophora brassicae on Oilseed Rape in Chile
R Galdames1, N Aguilera1, M Mera1
1INIA-Carillanca, Temuco, Chile.
Plant Disease
|February 2, 2019
Summary
Club root disease caused by Plasmodiophora brassicae was confirmed in oilseed rape (Brassica napus L.) fields in southern Chile. This finding marks the first confirmed case and highlights potential risks to the crop, possibly linked to contaminated imported seeds.
Area of Science:
- Plant Pathology
- Agronomy
- Molecular Diagnostics
Background:
- Club root, caused by Plasmodiophora brassicae, is a destructive disease affecting Brassica crops.
- Oilseed rape (Brassica napus L.) is a significant agricultural crop in southern Chile.
- Previous reports of club root in Chile lacked specific location and incidence data.
Purpose of the Study:
- To confirm the presence and causal agent of club root disease in oilseed rape in southern Chile.
- To evaluate the pathogenicity of the identified pathogen.
- To investigate potential sources of the pathogen, including seed contamination.
Main Methods:
- Field surveys to identify symptomatic plants in La Araucanía region, Chile.
- Microscopic examination of root tissues to identify plasmodia and resting spores.
- Greenhouse pathogenicity tests using inoculated oilseed rape seedlings.
- Specific Polymerase Chain Reaction (PCR) assays for Plasmodiophora brassicae detection in field and seed samples.
Main Results:
- Typical club root symptoms (root swellings) were observed in oilseed rape plants in 2010 and 2013.
- Microscopic and PCR analyses confirmed Plasmodiophora brassicae as the causal agent.
- Pathogenicity tests successfully reproduced club root symptoms.
- PCR analysis of seed lots suggested potential contamination with P. brassicae.
Conclusions:
- This study provides the first confirmed report of club root disease in commercial oilseed rape fields in Chile.
- The findings indicate a significant threat to oilseed rape production in the region.
- Contaminated imported seed is a potential pathway for pathogen introduction and spread.
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