Variation in Elymus repens susceptibility to glyphosate

Åkerblom Espeby, LivSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för växtproduktionsekologi,Department of Crop Production Ecology,Department of Crop Production Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden (författare)

Continuous increase in glyphosate use in Sweden has caused concern about resistance development, not least inconnection with the possible introduction of crops resistant to glyphosate. In Sweden, the main weed targetedby glyphosate is Elymus repens (L.) Gould. We sampled 69 clones of E. repens to assess the magnitude andgeographical distribution of variation in susceptibility to glyphosate. Clones originated from four habitat types:intensively and extensively used arable lands, field vicinities and other habitats, including natural vegetation.Susceptibility varied greatly among clones with GR50 (50% of untreated growth reduction) spanning over atleast one order of magnitude, 17–278 active ingredient ha−1 in a pot experiment setting. There was a strongcovariance between geographic and genetic distance, but there was no evidence of geographic or geneticdifferentiation in GR50. Nor did GR50 vary consistently between habitat types. We conclude that no indicationof past selection was found towards the resistance to glyphosate in E. repens clones in Sweden. The greatvariability in susceptibility suggests that there might be a potential for such selection.

Fogelfors, HåkanSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för växtproduktionsekologi,Department of Crop Production Ecology,Department of Crop Production Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden(Swepub:slu)47598 (författare)
Sjödal, SaraDepartment of Crop Production Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden (författare)
Milberg, PerSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Linköpings universitet,Biologi,Tekniska högskolan,Conservation Ecology Group,Institutionen för växtproduktionsekologi,Department of Crop Production Ecology(Swepub:slu)52524 (författare)
Sveriges lantbruksuniversitetInstitutionen för växtproduktionsekologi (creator_code:org_t)
Sveriges lantbruksuniversitet

Ingår i:Acta Agriculturae Scandinavica - Section B: Taylor & Francis64:3, s. 211-2190906-47101651-1913

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