title: How glyphosate affects plant disease development: it is more than enhanced susceptibility.
abstract: Glyphosate has been shown to affect the development of plant disease in several ways. Plants utilize phenolic and other shikimic acid pathway-derived compounds as part of their defense against pathogens, and glyphosate inhibits the biosynthesis of these compounds via its mode of action. Several studies have shown a correlation between enhanced disease and suppression of phenolic compound production after glyphosate. Glyphosate-resistant crop plants have also been studied for changes in resistance as a result of carrying the glyphosate resistance trait. The evidence indicates that neither the resistance trait nor application of glyphosate to glyphosate-resistant plants increases susceptibility to disease. The only exceptions to this are cases where glyphosate has been shown to reduce rust diseases on glyphosate-resistant crops, supporting a fungicidal role for this chemical. Finally, glyphosate treatment of weeds or volunteer crops can cause a temporary increase in soil-borne pathogens that may result in disease development if crops are planted too soon after glyphosate application. © 2017 Society of Chemical Industry.
authors.affiliation: Department of Plant, Soil and Microbial Sciences, 578 Wilson Road, Michigan State University, East Lansing, MI, USA.
authors.forename: Ray
authors.initials: R
authors.lastname: Hammerschmidt
mesh_terms: D018556:Crops, Agricultural / Q000382:microbiology*; D004198:Disease Susceptibility / Q000209:etiology*; D005998:Glycine / Q000031:analogs & derivatives* / Q000502:physiology; D006540:Herbicides; D010935:Plant Diseases / Q000209:etiology*; D000097797:Glyphosate
chemical_list: D005998:Glycine; D006540:Herbicides; D000097797:Glyphosate
keywords: Clavibacter; Fusarium; Pseudomonas; Pythium; Rhizoctonia; Sclerotinia; barley; bean; fungicide; glyphosate; glyphosate resistance; phytoalexins; plant defense; plant disease; root disease; rust diseases; shikimic acid pathway; soybean; sugarbeet; wheat