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Alleles Contributing to ACCase-Resistance in an Italian Ryegrass (Lolium perenne ssp. multiflorum) Population from Oregon

Published online by Cambridge University Press:  20 January 2017

Bianca A. B. Martins*
Crop and Soil Science Department, Oregon State University, 107 Crop Science Building, Corvallis, OR, 97331
Alejandro Perez-Jones
Monsanto Co., 800 N. Lindbergh Blvd. Mail Stop U2B, St Louis, MO 63167
Andrew G. Hulting
Crop and Soil Science Department, Oregon State University, 107 Crop Science Building, Corvallis, OR, 97331
Carol Mallory-Smith
Crop and Soil Science Department, Oregon State University, 107 Crop Science Building, Corvallis, OR, 97331
Corresponding author's E-mail:


Acetyl-coenzyme A carboxylase (ACCase)–resistant Italian ryegrass is one of the most difficult-to-control weeds in United States wheat-production systems. Seed was collected from a suspected ACCase-resistant Italian ryegrass population in a winter wheat field with a history of ACCase-inhibitor herbicide use. This study investigated cross-resistance patterns in this Italian ryegrass population. Resistance was identified to the commercial dose of the ACCase herbicides pinoxaden, clethodim, sethoxydim, and clodinafop. Partial chloroplastic ACCase sequences revealed aspartate-to-glycine or isoleucine-to-asparagine substitutions at positions 2078 or 2041 in individuals of the resistant population. This is the first report, to our knowledge, of Asp-2078-Gly and Ile-2041-Asn substitutions in ACCase-resistant Italian ryegrass in the United States. Associating the occurrence of resistance alleles with resistance to specific active ingredients provides a better understanding of ACCase cross-resistance in Italian ryegrass and possibly options for its control.

Weed Biology and Ecology
Copyright © Weed Science Society of America 

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