Breeding oilseed rape for disease resistance through crosses with its progenitors


Along its life cycle, oilseed rape (OSR, Brassica napus) can be attacked by many diseases caused mainly by aerial and root pathogens. With the high demand for OSR oil, the area under OSR cultivation has deeply increased in Europe and around the world. This increases threat OSR production due to shorter rotations that led to higher disease pressure. This threat could even increase for some diseases in a near future due to global warming. The most common strategies used to control these diseases include the use of plant genetic resistance (when available) and the use of pesticides. With the objectives of reducing the use of pesticides, the development of integrated pest management will more and more rely upon the identification, utilization and ultimate deployment of effective and durable host resistances to the most important pathogens through the design of new multi-resistant varieties. In oilseed rape, many efforts aimed at describing the genetic architecture of disease resistance. However, there is a lack of genetic variability for resistance within OSR for many diseases despite some valuable resistance sources have been identified in the progenitors of OSR, B. oleracea or B. rapa. Thus, in order to progress towards multi-resistant varieties, there is a need for a broader use of Brassica diversity through the identification and introgression into oilseed rape of valuable resistance alleles for breeding.


The general objective of HERNICOL and MULTIM projects is to set up optimized breeding schemes for the introgression of new resistance variability in OSR for Clubroot, Sclerotinia and Verticillium diseases. The identification of key genomic regions (and associated markers) involved in these resistances will be used to produce original pre-breeding materials from intercrosses between oilseed rape and its two progenitors, taking advantage of the unique recombination pattern observed in Brassica triploids.


R. Delourme, M. Manzanares-Dauleux, A.M. Chèvre, M. Rousseau-Gueutin (IGEPP Le Rheu); GIE Colza (3 seed companies: Lidea, Limagrain Europe, RAGT Semences R2n).


Modification date : 06 February 2023 | Publication date : 31 January 2022 | Redactor : IGEPP