California State University: Glyphosate Resistance in Hairy Fleabane

This report investigates the genetic mechanisms underlying glyphosate resistance in the agricultural weed, hairy fleabane (Erigeron bonariensis), prevalent in California's Central Valley. The study aims to determine if specific genes, including EPSPS and ABC transporter genes (M10 and M11), are involved in the weed's resistance to glyphosate. Researchers collected samples from various wild populations before and after glyphosate application and used quantitative PCR (qPCR) to analyze gene expression levels. The research seeks to identify if the upregulation of these genes contributes to the weed's ability to survive herbicide treatments. The study also considers the role of reduced glyphosate translocation, a non-target site resistance mechanism. The findings will provide crucial insights into the evolution of herbicide resistance and suggest alternative weed control strategies.