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1 January 2012 Acetolactate Synthase (ALS) Inhibitor-Resistant Wild Buckwheat (Polygonum convolvulus) in Alberta
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Abstract

Wild buckwheat is the most abundant broadleaf weed across the Prairie region of western Canada. Acetolactate synthase (ALS)-inhibiting herbicides are commonly used to control this species and other broadleaf weeds in cereal crops. A field survey in Alberta in 2007 identified a single population that was putatively resistant to ALS-inhibiting herbicides. In herbicide resistance screening in the greenhouse, all F1 progeny tested were resistant to the ALS-inhibiting herbicides thifensulfuron/tribenuron, a sulfonylurea herbicide, or florasulam, a triazolopyrimidine herbicide; dose response of shoot biomass indicated the population was 10- and 20-fold less sensitive to thifensulfuron/tribenuron and florasulam, respectively, than a susceptible control population. ALS gene sequencing of 24 F1 progeny indicated that the Trp574Leu target-site mutation was responsible for conferring ALS-inhibitor resistance in this biotype, the first global report of ALS-inhibitor resistance for this species. Because this mutation typically endows high-level resistance across all five ALS-inhibitor classes, this wild buckwheat biotype may only be controlled by a different site-of-action herbicide.

Nomenclature: Florasulam; thifensulfuron; tribenuron; wild buckwheat, Polygonum convolvulus L. POLCO.

Weed Science Society of America
HUGH J. BECKIE, Suzanne I. Warwick, and Connie A. Sauder "Acetolactate Synthase (ALS) Inhibitor-Resistant Wild Buckwheat (Polygonum convolvulus) in Alberta," Weed Technology 26(1), (1 January 2012). https://doi.org/10.1614/WT-D-11-00096.1
Received: 6 July 2011; Accepted: 1 September 2011; Published: 1 January 2012
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