Variety traits

Herbicide Resistance in Perennial Ryegrass

Lolium perenne L.

Herbicide resistance in perennial ryegrass is viewed as the process of population resistance development to ALS and ACCase inhibitors. This trait is identified through molecular mutations and the resistance index in dose-response bioassays.

In the reference 12 varieties crop Perennial ryegrass, where this is mentioned in the description.

In perennial ryegrass, herbicide resistance manifests as the ability of plants to survive treatment with specific classes of preparations, which is due to genetic mutations in acetolactate synthase (ALS) or acetyl-CoA carboxylase (ACCase) genes. The presence of this trait in commercial cultivars is generally considered a negative factor, leading to the transformation of crops into difficult-to-control weed populations in crop rotations.

Resistance assessment is conducted using the dose-response method, where the key metric is the resistance index, reflecting the fold-increase in herbicide dose required to suppress a resistant population compared to a susceptible one. Molecular monitoring using SNP analysis confirms the unintended fixation of the trait in a number of commercial cultivars, which necessitates a revision of chemical protection strategies and the integration of agrotechnical control methods.

General information about the subject — on the page Herbicide tolerance.

Sources4

Varieties of Perennial ryegrass mentioned in the description

Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.