Diseases
Downy mildew of grape — hybrids between Vitis rotundifolia Michx. and Vitis vinifera L.
hybrids between Vitis rotundifolia Michx. and Vitis vinifera L.
The resistance of interspecific hybrids to the pathogen Plasmopara viticola is due to the introgression of genetic material from Vitis rotundifolia, including the Rpv2 locus, which provides extreme resistance.
In the reference 4 varieties crop hybrids between Vitis rotundifolia Michx. and Vitis vinifera L., where this is mentioned in the description.
Hybrids of Vitis rotundifolia and Vitis vinifera inherit from V. rotundifolia active defense mechanisms against Plasmopara viticola, such as callose deposition and cell fluorescence upon pathogen invasion attempts. Unlike pure V. vinifera forms, these hybrids maintain resistance even under high infectious pressure, where susceptible varieties are completely affected.
The genetic architecture of resistance in these hybrids includes the specific Rpv2 locus, which belongs to a cluster of NLR genes. To monitor the introgression of these genomic regions in breeding programs, molecular markers are used. The level of population infection is assessed on a five-point scale, covering a spectrum from immune response to susceptibility, while the creation of such hybrids is complicated by biological barriers between the subgenera Euvitis and Muscadinia.
General information about the subject — on the page Downy mildew of grapevines.
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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