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1 July 2014 Alleles Contributing to ACCase-Resistance in an Italian Ryegrass (Lolium perenne ssp. multiflorum) Population from Oregon
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Abstract

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.

Nomenclature: Clethodim; clodinafop; pinoxaden; sethoxydim; Italian ryegrass, Lolium perenne L. ssp. multiflorum (Lam.) Husnot LOLMU; winter wheat, Triticum aestivum L.

Weed Science Society of America
Bianca A. B. Martins, Elena Sánchez-Olguín, Alejandro Perez-Jones, Andrew G. Hulting, and Carol Mallory-Smith "Alleles Contributing to ACCase-Resistance in an Italian Ryegrass (Lolium perenne ssp. multiflorum) Population from Oregon," Weed Science 62(3), 468-473, (1 July 2014). https://doi.org/10.1614/WS-D-13-00169.1
Received: 14 November 2013; Published: 1 July 2014
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