Variation in Pathogenicity and Aggressiveness ofErysiphe necatorfrom DifferentVitisspp. and Geographic Origins in the Eastern United States
Open Access
- 1 November 2010
- journal article
- Published by Scientific Societies in Phytopathology®
- Vol. 100 (11), 1185-1193
- https://doi.org/10.1094/phyto-01-10-0023
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.Keywords
This publication has 43 references indexed in Scilit:
- Phylogeography and population structure of the grape powdery mildew fungus, Erysiphe necator, from diverse Vitis speciesBMC Evolutionary Biology, 2010
- Ecological Genetic Divergence of the Fungal PathogenDidymella rabieion Sympatric Wild and DomesticatedCicerspp. (Chickpea)Applied and Environmental Microbiology, 2010
- Genetic Structure and Aggressiveness of Erysiphe necator Populations during Grapevine Powdery Mildew EpidemicsApplied and Environmental Microbiology, 2008
- The Origins of Plant Pathogens in Agro-EcosystemsAnnual Review of Phytopathology, 2008
- On the Origin and Spread of the Scab Disease of Apple: Out of Central AsiaPLOS ONE, 2008
- Powdery Mildew Induces Defense-Oriented Reprogramming of the Transcriptome in a Susceptible But Not in a Resistant GrapevinePlant Physiology, 2007
- Genetic Variation and Population Structure of the Grape Powdery Mildew Fungus, Erysiphe necator, in Southern FranceEuropean Journal of Plant Pathology, 2005
- The Biology of Phytophthora infestans at Its Center of OriginAnnual Review of Phytopathology, 2005
- Variation in pathogen aggressiveness within a metapopulation of the Cakile maritima–Alternaria brassicicola host–pathogen associationPlant Pathology, 2005
- Chitinase and β-1,3-glucanase in grapevine leaves: a possible defence against powdery mildew infectionAustralian Journal of Grape and Wine Research, 1998