No evidence for early fitness penalty in glyphosate-resistant biotypes of Conyza canadensis: Common garden experiments in the absence of glyphosate.

ABSTRACT: Strong selection from herbicides has led to the rapid evolution of herbicide-resistant weeds, greatly complicating weed management efforts worldwide. In particular, overreliance on glyphosate, the active ingredient in RoundUp^®, has spurred the evolution of resistance to this herbicide in ≥40 species. Previously, we reported that Conyza canadensis (horseweed) has evolved extreme resistance to glyphosate, surviving at 40× the original 1× effective dosage. Here, we tested for underlying fitness effects of glyphosate resistance to better understand whether resistance could persist indefinitely in this self-pollinating, annual weed. We sampled seeds from a single maternal plant ("biotype") at each of 26 horseweed populations in Iowa, representing nine susceptible biotypes (S),

SUBMITTER: Beres ZT 

PROVIDER: S-EPMC6953693 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature