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

作者：Martins Bianca A B^*; Sanchez Olguin Elena; Perez Jones Alejandro; Hulting Andrew G; Mallory Smith Carol

来源：Weed Science, 2014, 62(3): 468-473.

DOI：10.1614/WS-D-13-00169.1

• Acetyl-CoA carboxylase
• aryloxyphenoxypropionate
• cross-resistance
• cyclohexanedione
• phenylpyrazolin
• target-site resistance

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.

• 出版日期2014-9