Geographic Distribution of Cryptic Species of Plasmopara viticola Causing Downy Mildew on Wild and Cultivated Grape in Eastern North America

• DOI: 10.1094/phyto-08-13-0225-r
• Publication Date: 2014-06-10T15:48:40Z
• Authors: Mélanie Rouxel; Pere Mestre; Anton Baudoin; Odile Carisse; Laurent Delière; Michael A. Ellis; David Gadoury; Jiang Lu; Mizuho Nita; Sylvie Richard-Ce...; Annemiek Schilder; Alice Wise; François Delmotte
• Keywords: Plasmopara viticola; Vitaceae; Species complex

The putative center of origin Plasmopara viticola, the causal agent grape downy mildew, is eastern North America, where it has been described on several members family Vitaceae (e.g., Vitis spp., Parthenocissus and Ampelopsis spp.). We have completed first large-scale sampling P. viticola isolates across a range wild cultivated host species distributed throughout above region. Sequencing results four partial genes indicated presence new vulpina in Virginia, adding to cryptic recently recorded. phylogenetic analysis also that found quinquefolia America identical muralis Europe. geographic distribution five pathogen was determined through internal transcribed spacer polymorphism 896 viticola. Among three grape, one restricted interspecific hybrids within northern part America. A second recovered from V. vinifera labrusca, most sampled third species, although less abundant, larger geographical range, including southern clade aestivalis predominated (83% isolates) vineyards European winegrape area, indicating single may represent primary threat