HRAC GROUP 2 (LEGACY B) RESISTANT RUSSIAN-THISTLE
(Salsola tragus)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

United States, Montana

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INTRODUCTION RUSSIAN-THISTLE Russian-thistle (Salsola tragus) is a dicot weed in the Chenopodiaceae family.  In Montana this weed first evolved resistance to Group 2 (Legacy B) herbicides in 1987 and infests Cropland, and Wheat.   Group 2 (Legacy B) herbicides are known as Inhibition of Acetolactate Synthase (Inhibition of Acetolactate Synthase ).  Research has shown that these particular biotypes are resistant to chlorsulfuron and they may be cross-resistant to other Group 2 (Legacy B) herbicides. The 'Group' letters/numbers that you see throughout this web site refer to the classification of herbicides by their site of action. To see a full list of herbicides and HRAC herbicide classifications click here.

QUIK STATS (last updated Sep 15, 2000 ) Common Name Russian-thistle Species Salsola tragus Group Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B) Herbicides chlorsulfuron Location United States, Montana Year 1987 Situation(s) Cropland, and Wheat Contributors - (Alphabetically) Alvin Bussan  Edit this Case  |  Add New Case of Resistance  |  Add Note

ACADEMIC ASPECTS Confirmation Tests Field, Greenhouse, and Laboratory trials comparing a known susceptible Russian-thistle biotype with this Russian-thistle biotype have been used to confirm resistance. For further information on the tests conducted please contact the local weed scientists that provided this information.   Genetics Genetic studies on HRAC Group 2 resistant Russian-thistle have not been reported to the site.  There may be a note below or an article discussing the genetics of this biotype in the Fact Sheets and Other Literature   Mechanism of Resistance The mechanism of resistance for this biotype is either unknown or has not been entered in the database.  If you know anything about the mechanism of resistance for this biotype then please update the database.   Relative Fitness There is no record of differences in fitness or competitiveness of these resistant biotypes when compared to that of normal susceptible biotypes.  If you have any information pertaining to the fitness of Group 2 (Legacy B) resistant Russian-thistle from Montana please update the database.   Edit Case  |  Add Note  |  Add Article  |  Add New Case  |  Help

CONTRIBUTING WEED SCIENTISTS ALVIN BUSSAN Montana State University 747 Ridgemark Drive Bozeman, 59717-3120, Montana United States Email Alvin Bussan

ACKNOWLEDGEMENTS The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Montana have been instrumental in providing you this information. Particular thanks is given to Alvin Bussan for providing detailed information.

Herbicide Resistant Russian-thistle Globally (Salsola tragus) Herbicide Resistant Russian-thistle Globally (Salsola tragus) Drag a column header and drop it here to group by that column Herbicide Resistant Russian-thistle Globally (Salsola tragus) # Country Country StateName FirstYear Situation Active Ingredients CountryID Site of Action WeedID Species CommonName ResistID 1 Argentina Argentina   2019 Soybean glyphosate 48 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G) 147 Salsola tragus Russian-thistle 19218 2 Canada (Saskatchewan) Canada Saskatchewan 1989 Wheat chlorsulfuron 7 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B) 147 Salsola tragus Russian-thistle 5067 3 Canada (Alberta) Canada Alberta 2007 Spring Barley, and Wheat thifensulfuron-methyl, and tribenuron-methyl 7 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B) 147 Salsola tragus Russian-thistle 7831 4 United States (Washington) United States Washington 1987 Wheat chlorsulfuron 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B) 147 Salsola tragus Russian-thistle 231 5 United States (Montana) United States Montana 1987 Cropland, and Wheat chlorsulfuron 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B) 147 Salsola tragus Russian-thistle 411 6 United States (Idaho) United States Idaho 1990 Wheat chlorsulfuron 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B) 147 Salsola tragus Russian-thistle 512 7 United States (Oregon) United States Oregon 1993 Wheat chlorsulfuron, metsulfuron-methyl, and triasulfuron 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B) 147 Salsola tragus Russian-thistle 1173 8 United States (California) United States California 1994 Roadsides chlorsulfuron, and sulfometuron-methyl 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B) 147 Salsola tragus Russian-thistle 1036 9 United States (Montana) United States Montana 2015 Fallow, and Wheat glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G) 147 Salsola tragus Russian-thistle 12032 10 United States (Washington) United States Washington 2015 Fallow glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G) 147 Salsola tragus Russian-thistle 18160 11 United States (Oregon) United States Oregon 2016 Fallow glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G) 147 Salsola tragus Russian-thistle 13055

Literature about Similar Cases

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Warwick, S. I. ; Sauder, C. A. ; Beckie, H. J.. 2010. Acetolactate synthase (ALS) target-site mutations in ALS inhibitor-resistant Russian thistle (Salsola tragus). Weed Science 58 : 244 - 251.

ALS inhibitor-resistant biotypes are the fastest growing class of herbicide-resistant (HR) weeds. A Canadian ALS inhibitor-resistant biotype of Russian thistle was first reported in 1989. The molecular basis for ALS-inhibitor resistance is unknown for Canadian populations of this polyploid weed species, and was determined in this study for one Alberta and two Saskatchewan HR Russian thistle populations. HR plants survived spray application of the ALS-inhibitor mixture thifensulfuron:tribenuron in the greenhouse. All three HR Russian thistle populations were heterogeneous and contained both HR and herbicide-susceptible (HS) individuals. The molecular basis for resistance was determined by sequencing the ALS gene and/or conducting a TaqMan genotyping assay for single nucleotide polymorphism (SNP) for the Trp₅₇₄Leu mutation. Two target-site mutations were observed: Trp₅₇₄Leu in all three biotypes (554 individuals) and Pro₁₉₇Gln in one biotype (one individual), suggesting multiple-founding events for Russian thistle HR populations in western Canada. Segregation patterns among F1 and F2 progeny arrays of HR lines sprayed under greenhouse conditions varied; some segregated (i.e., had HR and HS progeny), whereas other lines were exclusively HR. In contrast, no segregation of molecular types, i.e., Trp₅₇₄, Trp/Leu₅₇₄ and Leu₅₇₄, as would be expected with heterozygosity at a single locus Trp/Leu₅₇₄, was observed. Such lack of segregation is consistent with the polyploid genome structure of Russian thistle and the presence of two copies of the ALS gene. The presence of more than one ALS gene confounded the ability of the molecular techniques to accurately identify "true" heterozygotes in this study..

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