Assessment of the impact of resistant and susceptible canola on Plasmodiophora brassicae inoculum potential

The impact on clubroot severity of growing susceptible canola or mixtures of resistant and susceptible canola genotypes was examined. Bioassays revealed greater clubroot severity and incidence, and reduced plant height, where 100% of a susceptible cultivar had been grown. A higher proportion of susc...

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Published in:Plant pathology 2012-10, Vol.61 (5), p.945-952
Main Authors: Hwang, S. F, Ahmed, H. U, Zhou, Q, Strelkov, S. E, Gossen, B. D, Peng, G, Turnbull, G. D
Format: Article
Language:English
Subjects:
Bioassays
Biological and medical sciences
Brassica napus
canola
Cultivars
Deoxyribonucleic acid
disease incidence
disease resistance
disease severity
DNA
Fundamental and applied biological sciences. Psychology
Fungal plant pathogens
genotype
Genotypes
inoculum
Phytopathology. Animal pests. Plant and forest protection
Plasmodiophora brassicae
polymerase chain reaction
Protozoa. Invertebrates
qPCR
Regression analysis
root hairs
volunteers
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Summary:The impact on clubroot severity of growing susceptible canola or mixtures of resistant and susceptible canola genotypes was examined. Bioassays revealed greater clubroot severity and incidence, and reduced plant height, where 100% of a susceptible cultivar had been grown. A higher proportion of susceptible plants within a resistant canola crop increased root hair and secondary infections. Regression analysis of root hair infection and the amount of Plasmodiophora brassicae DNA (as determined by quantitative PCR) revealed strong linear relationships between the two parameters. The linear relationships between root hair infection and P. brassicae DNA were stronger for the resistant cultivar than for the susceptible cultivar when regression analysis was conducted by cultivar over the sampling dates. In conclusion, the cropping of a resistant cultivar reduced clubroot severity, while the presence of susceptible volunteer canola increased inoculum potential. Quantitative PCR was a reliable tool for the quantification of root hair infection.
ISSN:0032-0862
1365-3059
DOI:10.1111/j.1365-3059.2011.02582.x