Abstract
Eastern North America is considered the center of diversity for many Vitis spp. and for the grape powdery mildew pathogen, Erysiphe necator. However, little is known about populations of E. necator from wild Vitis spp. We determined the phenotypic variation in pathogenicity and aggressiveness of E. necator among isolates from wild and domesticated Vitis spp. from diverse geographic regions in the eastern United States. To test pathogenicity, we inoculated 38 E. necator isolates on three wild Vitis spp., two commercially grown hybrids and the European wine grape, Vitis vinifera. V. rotundifolia (muscadine grape) was the only host species on which complete host specialization was evident; it was only susceptible to isolates collected from V. rotundifolia. All isolates, regardless of source host, were pathogenic on the other Vitis spp. We found no differences in components of aggressiveness latent period and lesion size among isolates from different source hosts when inoculated on V. vinifera, which is highly susceptible to powdery mildew. However significant variation was evident among isolates on the more resistant V. labruscana 'Niagara'. Isolates from the wild species V. aestivalis were the most aggressive, whereas isolates from V. vinifera were not more aggressive than isolates from other source hosts. Greater aggressiveness was also detected among isolates from the southeastern United States compared with isolates from the northeastern United States.
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Claims 7
Claim · model-written summary
Vitis rotundifolia was susceptible only to E. necator isolates from V. rotundifolia, showing complete host specialization.
- Taxon
- V. rotundifolia
Vitis rotundifoliae1 - Interactor
- Erysiphe necator
Erysiphe necatore0pathogen - Outcome
- complete host specializatione1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vitis spp. and for the grape powdery mildew pathogen, Erysiphe necator”
e1“V. rotundifolia (muscadine grape) was the only host species on which complete host specialization was evident”
Claim · model-written summary
All E. necator isolates were pathogenic on the other Vitis species.
- Interactor
- Erysiphe necatorErysiphe necatore0pathogen
- Outcome
- pathogenice2
VitisOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vitis spp. and for the grape powdery mildew pathogen, Erysiphe necator”
e2“All isolates, regardless of source host, were pathogenic on the other Vitis spp.”
Claim · model-written summary
On V. vinifera, no differences in latent period or lesion size among isolates from different source hosts.
- Taxon
- V. vinifera
Vitis viniferae3 - Treatment
- different source hostse3
- Interactor
- Erysiphe necatorErysiphe necatore0pathogen
- Outcome
- latent period and lesion sizee3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vitis spp. and for the grape powdery mildew pathogen, Erysiphe necator”
e3“We found no differences in components of aggressiveness latent period and lesion size among isolates from different source hosts when inoculated on V. vinifera”
Claim · model-written summary
Significant variation in aggressiveness occurred among isolates on the more resistant V. labruscana Niagara.
- Taxon
- V. labruscana
Vitis ×labruscanae4 - Material
- 'Niagara'e4
- Interactor
- Erysiphe necatorErysiphe necatore0pathogen
- Outcome
- variatione4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vitis spp. and for the grape powdery mildew pathogen, Erysiphe necator”
e4“However significant variation was evident among isolates on the more resistant V. labruscana 'Niagara'”
Claim · model-written summary
Isolates from the wild species V. aestivalis were the most aggressive.
- Taxon
- V. aestivalis
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Vitis aestivalise5 - Interactor
- Erysiphe necatorErysiphe necatore0pathogen
- Outcome
- aggressivee5
- Direction
- moste5
- Qualifier
- Isolates from the wild speciese5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Vitis spp. and for the grape powdery mildew pathogen, Erysiphe necator”
e5“Isolates from the wild species V. aestivalis were the most aggressive”
Claim · model-written summary
Isolates from V. vinifera were not more aggressive than isolates from other source hosts.
- Taxon
- V. viniferaVitis viniferae6
- Interactor
- Erysiphe necatorErysiphe necatore0pathogen
- Outcome
- aggressivee6
- Direction
- not moree6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vitis spp. and for the grape powdery mildew pathogen, Erysiphe necator”
e6“isolates from V. vinifera were not more aggressive than isolates from other source hosts”
Claim · model-written summary
Isolates from the southeastern United States were more aggressive than those from the northeastern United States.
- Interactor
- Erysiphe necatorErysiphe necatore0pathogen
- Outcome
- aggressivenesse7
- Direction
- Greatere7
- Comparator
- northeastern United Statese7
- Setting
- southeastern United Statese7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vitis spp. and for the grape powdery mildew pathogen, Erysiphe necator”
e7“Greater aggressiveness was also detected among isolates from the southeastern United States compared with isolates from the northeastern United States”