Diseases
Powdery mildew in hybrids between Vitis rotundifolia Michx. and Vitis vinifera L.
hybrids between Vitis rotundifolia Michx. and Vitis vinifera L.
The causative agent of powdery mildew on these hybrids is the fungus Erysiphe necator. Resistance is provided by the dominant Run1 gene, derived from Vitis rotundifolia, which confers near-total immunity to the pathogen.
In the reference 5 varieties crop hybrids between Vitis rotundifolia Michx. and Vitis vinifera L., where this is mentioned in the description.
The causative agent of powdery mildew on hybrids between Vitis vinifera and Vitis rotundifolia is the ascomycete Erysiphe necator (synonyms Oidium tuckeri, Uncinula necator). Unlike susceptible V. vinifera cultivars, hybrid forms carrying V. rotundifolia genetic material exhibit high resistance to the disease, manifested by the absence or extremely weak appearance of white powdery bloom on the plant's green organs.
The key genetic factor for protection is the dominant Run1 (Resistance to Uncinula necator 1) gene, which provides extreme resistance to the pathogen. This gene is often transmitted into breeding material along with the RPV1 locus, which is responsible for resistance to downy mildew, as part of a single linkage block MrRUN1/MrRPV1. The dominant inheritance of this trait allows for the effective reproduction of a high degree of resistance in recombinant genotypes.
General information about the subject — on the page Powdery mildew.
Varieties of hybrids between Vitis rotundifolia Michx. and Vitis vinifera L. mentioned in the description
Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.
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