Variation Within and AmongVitisspp. for Foliar Resistance to the Powdery Mildew PathogenErysiphe necator
Open Access
- 1 February 2011
- journal article
- Published by Scientific Societies in Plant Disease
- Vol. 95 (2), 202-211
- https://doi.org/10.1094/pdis-02-10-0092
Abstract
To complement existing control strategies, grape growers desire cultivars with resistance to powdery mildew caused by Erysiphe necator. Numerous disease resistance screens of diverse Vitis germplasm have been conducted previously to identify powdery mildew resistance but ratings of named cultivars were inconsistent and identities of resistant individuals in wild species were not typically provided. In the current study, controlled inoculations of a single isolate were made onto detached leaves from 1,025 Vitis accessions. The results were compared with natural epidemics in two vineyards: the cold-hardy Vitis spp. repository in Geneva, NY, in 2007–08, and a replicated vineyard of 89 Vitis accessions in Fredonia, NY in 2006–08. Of the genotypes screened using both natural infection and single-isolate inoculation, 33% were resistant to a single isolate but susceptible to diverse isolates in either or both vineyards, possibly due to race-specific resistance. This was exemplified by selection of E. necator genotypes virulent to Vitis labrusca in the Fredonia, NY vineyard, which is surrounded by production of the interspecific labrusca hybrids Concord and Niagara. Otherwise, there was good correlation of ratings between the vineyard and single-isolate ratings (r = 0.55 to 0.56) and between Geneva and Fredonia vineyard ratings (r = 0.75). No accession rated in all three screens was immune from infection. Although individual accessions of V. aestivalis, V. palmata, Vitis × doaniana, and Ampelopsis brevipedunculata were resistant in Geneva and Fredonia, each well-represented species had notable intraspecific variation in resistance. For 129 interspecific hybrids in this and previous studies, ratings infrequently corresponded among previous studies (39%) and between the current and previous studies (17 to 46%). However, three cultivars (Cayuga White, Diana, and Mars) were consistently rated as resistant across four independent studies. The results underscore the importance of uniform testing in multiple environments and the need for strategies for the development of cultivars with durable resistance.Keywords
This publication has 11 references indexed in Scilit:
- The powdery mildew resistance gene REN1 co-segregates with an NBS-LRR gene cluster in two Central Asian grapevinesBMC Genomic Data, 2009
- Resistance to Erysiphe necator in the grapevine ‘Kishmish vatkana’ is controlled by a single locus through restriction of hyphal growthTheoretical and Applied Genetics, 2007
- Resistance Gene Analogs fromVitis cinerea,Vitis rupestris, andVitisHybrid HorizonAmerican Journal of Enology and Viticulture, 2007
- Genetic mapping and localization of quantitative trait loci affecting fungal disease resistance and leaf morphology in grapevine (Vitis vinifera L)Molecular Breeding, 2007
- Linkage maps of grapevine displaying the chromosomal locations of 420 microsatellite markers and 82 markers for R-gene candidatesTheoretical and Applied Genetics, 2007
- Development of SCAR markers linked to powdery mildew (Uncinula necator) resistance in grapevine (Vitis vinifera L. and Vitis sp.)Molecular Breeding, 2006
- Genetic and physical mapping of the grapevine powdery mildew resistance gene, Run1, using a bacterial artificial chromosome libraryTheoretical and Applied Genetics, 2005
- Establishment of a local map of AFLP markers around the powdery mildew resistance gene Run1 in grapevine and assessment of their usefulness for marker assisted selectionTheoretical and Applied Genetics, 2001
- Marker-assisted Selection for Powdery Mildew Resistance in GrapesJournal of the American Society for Horticultural Science, 2001
- Heterothallism and Pathogenic Specialization inUncinula necatorPhytopathology®, 1991