Variation Within and Between Vitis spp. for Foliar Resistance to the Downy Mildew Pathogen Plasmopara viticola

摘要: Cadle-Davidson, L. 2008. Variation within and between Vitis spp. for foliar resistance to the downy mildew pathogen Plasmopara viticola. Plant Dis. 92:1577-1584. To complement existing control strategies, grape growers in humid climates desire cultivars with caused by Numerous disease screens of diverse germplasm have been conducted previously identify resistance; however, ratings named were inconsistent identities resistant individuals wild species not typically provided. Inconsistencies among previous studies could be due race-specific resistance. In current study, controlled inoculations two single isolates onto leaf ages 883 accessions used these results compared natural infection a fivefold replicated vineyard 80 2006 2007. Of rated both assays, 16.2% isolate but susceptible vineyard. Otherwise, there was good correlation field assay rating older leaves (r = 0.62 0.71). Five from cinerea, V. labrusca, × champinii averaged zero severity years, yet some cinerea labrusca moderately or highly field. Similarly, although significant differences mean separated vinifera, hybrid, riparia, single-isolate (from resistant), notable intraspecies variation identified all well-represented species. Resistant most prominent exceptions vinifera acerifolia. Single-isolate, detached-leaf corresponded well (94.6%) 2007 using separate collected same Categorizing this studies, infrequently (31.9%) as (34.9%) (46.4%) ratings. These highlight important factors screens: age, genotype, host accession. The further underscore importance breeders uniform testing multiple environments.