The screening of more than 100 varieties for Black rot resistance gave encouraging results

03.03.2016

Several genes or loci associated with downy (Rpv 1, Rpv2, Rpv3, Rpv5, Rpv6, Rpv8, Rpv10 and Rpv12) and powdery mildews (Run1, Run2.1, Run2.2, Ren1, Ren3, Ren4 and Ren5) resistances have been identified in grapevines originating from America (Muscadina rotundifolia, V.rupestris, V.lincecumii), Asia (V.amurensis, V.romanetii) or Eastern Europe (Vitis vinifera L. cv Kishmish Vatkana). These grapevines are used to develop tolerant or partially resistant varieties to these pathogens and new breeding strategies aim at pyramiding these resistances. The term ‘monogenic’ refers to varieties containing one gene of resistance for downy and for powdery mildews while ‘polygenic’ designs cultivars having several genes with the most advanced varieties containing  2+2 genes. For Black rot, a secondary disease that should emerge with the expansion of resistant varieties and the reduction of the spraying targeted against downy mildew, sources of resistance in grapevine are very rare and limited to the Börner rootstock. Research works carried out during Innovine by the Research Institute for Viticulture and Enology (PTE) in Hungary allowed a reliable screening for Black rot resistance of 58 Georgian Vitis vinifera varieties and 64 interspecific and Vitis vinifera cultivars in 2015. Results are very encouraging as 3 of the tested varieties didn’t show any symptoms which open the way to the identification of novel sources of Black rot resistance.

To learn more about the works conducted on black rot resistance, contact Sarolta Hoffmann

 
 
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Innovine is a European collaborative project that has received funding from the European Union’s Seventh Framework Programme for research, technological development and demonstration under grant agreement n° 311775.
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