Programme de collaboration franco-suisse pour la création de nouvelles variétés de vigne durablement résistantes au mildiou et à l'oïdium

• Main Authors: Schneider, C, J.-L. Spring, Onimus, C, Prado, E, Verdenal, T, Lemarquis, G, Lorenzini, F, Ley, L, Duruz, P, Gindro, K, Merdinoglu, D
• Format: Conference Proceeding
• Language: eng ; fre
• Subjects: Agronomy; Airborne microorganisms; Chemical treatment; Cultivars; Cultivation; Disease resistance; Durability; Experimentation; Genetic crosses; Grapevines; Marker-assisted selection; Offspring; Phenotyping; Plant breeding; Polygenic inheritance; Powdery mildew; Resistance factors; Valleys; Wines
• ISSN: 2273-1709; 2117-4458
• DOI: 10.1051/bioconf/20191501018

An alternative promising solution to chemical treatments for grapevine protection against downy and powdery mildew is the development of resistant cultivars. The creation of such cultivars needs to take into account both of resistance efficacy and durability and agronomic performances, in particular for productivity and berry traits, which must be suitable for the production of high quality wines. Inra (France) has launched the ResDur breeding program, based on pyramiding of resistance factors, in 2000. Originating from this program, a first series of varieties with polygenic resistance to downy and powdery mildew – Artaban, Floreal, Vidoc and Voltis – were already registered in 2018. Agroscope has started breeding for resistance in 1996, by mobilizing the resistance from German varieties, mainly Bronner. A first achievement was the approval in Switzerland of Divico and Divona, respectively in 2013 and 2018. Agroscope and Inra have launched a partnership in 2009, in order to develop a shared breeding program and to combine the disease resistance factors carried in a complementary way by their respective breeding lines. The undertaken cross-breedings resulted, after marker assisted selection, in 400 offspring carrying the resistance factors Rpv1, Rpv10 and/or Rpv3; Run1, Ren3 and/or Ren3.2. Their agronomic and oenological phenotyping is achieved through a network of field trials located in both institutes, in Colmar (FR) and Pully (CH). The first multi-annual field observations realized on 80 individuals permitted to study their phenotypic stability for resistance, agronomic, and wine quality traits. Finally, 15 candidate varieties were selected and are currently under Value for Cultivation and Use (VCU) experimentation in Valais (CH) and in three French regions (Champagne, Loire Valley, Rhone Valley). The registration of the first varieties developed by INRA and Agroscope as co-owners is expected in 2024–2025.