Glyphosate resistance in Ambrosia trifida: Part 1. Novel rapid cell death response to glyphosate

• DOI: 10.1002/ps.4567
• Publication Date: 2017-03-07T05:47:01Z
• Authors: Christopher R Van...; Marcelo L Moretti; Renae R Robertson; Kabelo Segobye; Stephen C Weller; Bryan G Young; William G Johnson; Burkhard Schulz; Amanda C Green; Taylor Jeffery; Mackenzie A Lespé...; François J Tardif; Peter H Sikkema; J Christopher Hall; Michael D McLean; Mark B Lawton; R Douglas Sammons; Dafu Wang; Philip Westra; Todd A Gaines
• Keywords: Ontario; 0301 basic medicine; Glyphosate; 03 medical and health sciences; Cell Death; Herbicides; Glycine; Plant Weeds; Ambrosia; Tennessee; Herbicide Resistance; Midwestern United States

Glyphosate-resistant (GR) Ambrosia trifida is now present in the midwestern United States and southwestern Ontario, Canada. Two distinct GR phenotypes are known, including a rapid response (GR RR) phenotype, which exhibits cell death within hours after treatment, non-rapid NRR) phenotype. The mechanisms of resistance both RR NRR remain unknown. Here, we description phenotype an investigation target-site on multiple A. accessions.Glyphosate was confirmed several accessions, whole-plant levels ranged from 2.3- to 7.5-fold compared with glyphosate-susceptible (GS) accessions. two displayed similar resistance, despite having dramatically different phenotypic responses glyphosate. Glyphosate not associated mutations EPSPS sequence, increased copy number, quantity, or activity.These encompassing results suggest that glyphosate these accessions conferred by mechanism. © 2017 Society Chemical Industry.