S02 - Session P1 - BrACySol BRC : a center of valuable genetic resources to address major issues faced by potato and oilseed rape crops

Authors: Florence Esnault *, Vincent Richer, Marie Bousseau, Marie-Pierre Cann, Jean-Eric Chauvin, Marie-Ange Dantec, Régine Delourme, Stéphane Doré, Pascal Glory, Marie-Claire Kerlan, Marie-Paule Kermarrec, Anne Laperche, Lise-Anna Le Ven, Maryse Lodé-Taburel, Maria Manzanares-Dauleux, Sophie Paillard, Roland Pellé, Jocelyne Porhel, Mathieu Rousseau-Gueutin, Catherine Souchet, Sylvain Théréné, Anne-Marie Chèvre

The BrACysol BRC preserves collections of Solanum and Brassica genetic resources that represent a great genetic diversity. Here, we illustrate two examples of the involvement of BrACySol BRC in research programs to address agronomic issues faced by potato and Brassica crops. Potato, which is the fourth crop in the world, faces a great number of pathogens, including late blight disease which is controlled by a high level of fungicides. Resistance genes have already been used, however most of them are overcome. Therefore, genetic resources are explored for quantitative resistance. In order to identify durable late blight resistance sources within the BrACySol BRC, a panel of 122 breeding lines, selected from 1989 to 2007 for their high level of resistance to late blight disease, was reevaluated for this trait in 2017 and 2018 in the framework of the PoTStaR project, funded by the French National Ecophyto plan (Partners involved: INRAE, ACVNPT, FN3PT/Inov3PT, Arvalis). These experiments led to the identification of 60 breeding lines presenting a high level of durable resistance. These breeding lines are currently being used by breeders in their programs to create new resistant potato varieties. Turnips ( Brassica rapa, AA) and cabbages ( B. oleracea, CC) represent an important part of the world vegetable crops. They also are the progenitor species of oilseed rape ( B. napus , AACC). The BrACySol BRC maintains core collections of both diploid species. The diversity present in these core collections was exploited in the framework of ProBiodiv project, funded by Promosol. The allotriploid hybrids AAC and ACC allowed to introduce this diversity all along the A or C chromosomes as small genomic regions through homologous recombination. After backcrosses with B. napus and intercrosses, prebreeding populations were provided to breeders for selection of varieties with new traits.