DefendR Genetic Traits USA

DefendR® is an easy-to-understand approach that highlights the superior harvest management and disease resistance genetics developed by our primary canola breeding partner, DL Seeds.

The DefendR trait platform is gene-driven and can be an important piece of your overall canola management and production strategy. BrettYoung uses the DefendR designation to signal genetic tolerance to pod shatter and durable resistance to the three prominent disease complexes affecting canola: clubroot, blackleg, and sclerotinia.

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The introduction of pod shatter-resistant hybrids to canola growers several years ago led to a significant increase
in adoption of both direct harvesting and delayed swathing of canola crops. BrettYoung canola growers can now
enjoy this same flexibility because of our new pod shatter resistance trait, which delivers a dependable level
of shatter tolerance.

Pod shattering, and the seed dispersion associated with it, is a survival mechanism found in nature and, despite
decades of breeding and domestication, canola pods still have a natural tendency to split and open at maturity, with the goal of scattering seeds. Plant breeders and trait developers have been working to understand the physiology
of canola pod ripening and pod shatter mechanisms.

DL Seeds, and its parent companies, have researched their own solutions, and what has emerged is an understanding of a complex pathway of gene interaction that controls pod valve function.

Much of this work has meant isolating specific genes from other brassica species and breeding them into canola
to interrupt these shatter-inducing pathways. If you’ve ever grown mustard, you’re aware of the substantial pod
shatter resistance in that crop.

The result is Pod DefendR, a specific genetic trait that reduces pod tension built up at maturity and ultimately,
the tendency for canola pods to split at the pod dehiscence zone (pod seam) that holds both sides of the pod
(valves) together.

Clubroot is now established in all three Prairie provinces. Since 2013, when the first resistance-breaking
pathotype was identified in Alberta, several new and more virulent pathotypes have evolved that can evade
what is known as 1st generation (Mendel-type) resistance. The Clubroot DefendR trait indicates the canola
hybrid has 1st generation resistance stacked with newer, next-generation clubroot resistance gene(s). This approach means resistance to the older, first-identified pathotypes, but also resistance to recently identified ones like 3A, 3D, 3H, and 5X, and others. DL Seeds has a robust pipeline coupled to high-performance hybrids that BrettYoung will continue to commercialize to support you in keeping one step ahead of this impactful disease.

Blackleg is a disease that has made a resurgence in intensive canola production areas. Most agree that a combination of crop rotation, crop management (including regular field scouting), and proper hybrid selection are important factors to reducing the impact of this disease.

The Blackleg DefendR trait means the BrettYoung canola hybrid is rated as a strong R for blackleg resistance. It also means the hybrid incorporates multiple major genes to be completely resistant against specific races of the pathogen. Blackleg DefendR hybrids achieve an enhanced level of resistance compared to competitor’s R-rated hybrids that have either zero or only one major gene for blackleg resistance.

For growers wanting to further reduce the impact of this disease, BrettYoung’s Sclerotinia DefendR tolerance trait is built into the 6074 RR hybrid. Screening and testing results for this hybrid demonstrate improved tolerance that’s superior to susceptible checks using industry-approved testing protocol.

• Reduce the impacts of infection and reduce yield loss whenever higher sclerotinia disease pressure is present
• Allow for greater flexibility in fungicide application timing when flowering is uneven and staggered, which otherwise makes determining ideal fungicide application timing difficult
• Reduce the impact of sclerotinia in long-flowering crops where the window of fungicide protection has lapsed