Co-inoculated Plasmopara viticola genotypes compete for the infection of the host independently from the aggressiveness components
Open access
Date
2013-06Type
- Journal Article
ETH Bibliography
yes
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Abstract
During Plasmopara viticola epidemics only few genotypes produce most of the secondary lesions and dominate in the population. Selection of dominant genotypes is hypothesized to be linked to environmental conditions and can occur rapidly, particularly if there is also difference between genotypes in terms of fitness and aggressiveness. Measurements of aggressiveness components can largely determine the rate of epidemic development, although the components of aggressiveness do not take into account potential direct competition between genotypes. Differences in aggressiveness have been also reported to be greater under non-optimal conditions suggesting for genotype adaptation to different conditions. To evaluate differences in latency at non-optimal conditions, we characterized genotypes deriving from different climatic regions at three different temperatures (15, 25 and 35 °C) and we found no differences. To investigate whether other factors may impact on competition between P. viticola genotypes, we evaluated polycyclic infections of P. viticola by co-inoculating three genotypes with similar aggressiveness components in two different co-inoculation experiments and an increasing prevalence of one of the two genotypes was observed. Competition was not related to the origin of the genotype and we hypothesize that competitive selection is modulated by differences in the secretion of effector molecules which can contribute to the establishment of dominant genotypes over an epidemic season. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000066456Publication status
publishedExternal links
Journal / series
European Journal of Plant PathologyVolume
Pages / Article No.
Publisher
SpringerSubject
Fitness index; Competitive SSR amplification; Effectors; Plasmopara viticolaOrganisational unit
03516 - McDonald, Bruce / McDonald, Bruce
Notes
It was possible to publish this article open access thanks to a Swiss National Licence with the publisherMore
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ETH Bibliography
yes
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