Relationship between weed dormancy and herbicide rotations : implications in resistance evolution - Archive ouverte HAL
Article Dans Une Revue Pest Management Science Année : 2017

Relationship between weed dormancy and herbicide rotations : implications in resistance evolution

Nathalie Colbach
Valérie Le Corre

Résumé

It was suggested that selection for late germinating seed cohorts is significantly associated to herbicide-resistance in some cropping systems. In turn, it is conceivable that rotating herbicide modes of action selects for populations with mutations for increased secondary dormancy, thus partially overcoming the delaying effect of rotation on resistance evolution. Modified seed dormancy could affect management strategies-like herbicide rotation-that are used to prevent or control herbicide-resistance. Here, we review literature for data on seed dormancy and germination dynamics of herbicide-resistant versus susceptible plants. Few studies use plant material with similar genetic backgrounds, so there are few really comparative data. Increased dormancy and delayed germination may co-occur with resistance to ACCase inhibitors, but there was no clear-cut link with resistance to other herbicide classes. Population shifts are due in part to pleiotropic effects of the resistance genes, but interaction with the cropping system is also possible. We provide an example of a model simulation that accounts for genetic diversity in the dormancy trait, and subsequent consequences in various cropping systems. We strongly recommend adding more accurate and detailed mechanistic modelling to the current tools used today to predict the efficiency of prevention and management of herbicide resistance. These models should be validated through long-term experimental designs including mono-herbicide versus chemical rotation in the field. This article is protected by copyright. All rights reserved.
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Dates et versions

hal-01608351 , version 1 (03-10-2017)

Identifiants

Citer

Henri Darmency, Nathalie Colbach, Valérie Le Corre. Relationship between weed dormancy and herbicide rotations : implications in resistance evolution. Pest Management Science, 2017, 73 (10), pp.1994-1999. ⟨10.1002/ps.4611⟩. ⟨hal-01608351⟩
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