HRAC GROUP 9 (LEGACY G) RESISTANT COAT BUTTONS
(Tridax procumbens)

Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)

Australia, Western Australia

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INTRODUCTION COAT BUTTONS Coat Buttons (Tridax procumbens) is a dicot weed in the Asteraceae family.  In Western Australia this weed first evolved resistance to Group 9 (Legacy G) herbicides in 2016 and infests Sandalwood Plantation.   Group 9 (Legacy G) herbicides are known as Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (Inhibition of EPSP synthase).  Research has shown that these particular biotypes are resistant to glyphosate and they may be cross-resistant to other Group 9 (Legacy G) 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 Oct 27, 2016 ) Common Name Coat Buttons Species Tridax procumbens Group Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G) Herbicides glyphosate Location Australia, Western Australia Year 2016 Situation(s) Sandalwood Plantation Contributors - (Alphabetically) Stephen Powles  Edit this Case  |  Add New Case of Resistance  |  Add Note

NOTES ABOUT THIS BIOTYPE MECHANISM Stephen Powles A unique mutation at position 102 of the EPSPS gene that endows the resistance. Edit this Note  |  Add New Note

ACADEMIC ASPECTS Confirmation Tests Greenhouse, and Laboratory trials comparing a known susceptible Coat Buttons biotype with this Coat Buttons 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 9 resistant Coat Buttons 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 Studies on the mechanism of resistance of Group 9 (Legacy G) resistant Coat Buttons from Western Australia indicate that resistance is due to an altered target site.  There may be a note below or an article discussing the mechanism of resistance in the Fact Sheets and Other Literature   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 9 (Legacy G) resistant Coat Buttons from Western Australia please update the database.   Edit Case  |  Add Note  |  Add Article  |  Add New Case  |  Help

CONTRIBUTING WEED SCIENTISTS STEPHEN POWLES Professor And Research Director University Of Western Australia School Of Plant Biology 2276 Dahlk Circle Crawley, 6009, Western Australia Australia Email Stephen Powles Web   : Web Site Link

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

Herbicide Resistant Coat Buttons Globally (Tridax procumbens) Herbicide Resistant Coat Buttons Globally (Tridax procumbens) Drag a column header and drop it here to group by that column Herbicide Resistant Coat Buttons Globally (Tridax procumbens) # Country Country StateName FirstYear Situation Active Ingredients CountryID Site of Action WeedID Species CommonName ResistID 1 Australia (Western Australia) Australia Western Australia 2016 Sandalwood Plantation glyphosate 1 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G) 333 Tridax procumbens Coat Buttons 14052

Literature about Similar Cases

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Jingbo Li, Qiong Peng, Heping Han, Alex Nyporko, Tymofii Kulynych, Qin Yu, and Stephen Powles. 2018. Glyphosate resistance in Tridax procumbens via a novel EPSPS Thr-102-Ser substitution. Journal of Agricultural and Food Chemistry : .

This study confirmed the first case of glyphosate resistance in Tridax procumbens and investigated the glyphosate-resistance mechanisms. Sequencing and cloning of the full 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS) coding sequences revealed a point mutation (ACC to TCC) at amino acid position 102, resulting in a novel Thr-102-Ser substitution. Other possible resistance mechanisms (i.e., target-site EPSPS-gene overexpression, nontarget-site differential glyphosate uptake and translocation) were also examined and were unlikely to be involved in resistance in this population. Structural modeling of the wild-type and mutant EPSPS in complex with glyphosate and phosphoenolpyruvate (PEP) revealed that the Thr-102-Ser substitution weakly decreased EPSPS affinity to glyphosate, but sharply increased EPSPS affinity to the natural substrate, PEP. Therefore, this novel mutation is very likely responsible for the observed glyphosate resistance in this tetraploid weed species via dual mechanisms of reducing glyphosate binding and favoring PEP binding to EPSPS..

Maciel, C. D. de G. ; Poletine, J. P. ; Amstalden, S. L. ; Gazziero, D. L. P. ; Raimondi, M. A. ; Lima, G. R. G. ; Oliveira Neto, A. M. de ; Guerra, N. ; Justiniano, W.. 2011. Glyphosate tank mixtures controlling Commelina benghalensis, Tridax procumbens and Cenchrus echinatus in Soybean Roundup Ready®. Revista Ceres 58 : 35 - 42.

Although the use of glyphosate tank mixtures for managing weed species of difficult control is prohibited by the Brazilian legislation, it has been a common practice among farmers. This work aimed to evaluate the efficiency and selectivity of herbicide tank mixtures using glyphosate to control Commelina benghalensis L., Tridax procumbens L. and Cenchrus echinatus L. in soybean crop RR®. A field experiment was conducted in the Municipality of Maracai, São Paulo State, between November, 2006 and March 2007, using the genotype CD-214RR® in a complete randomized block design with 21 treatments and four replications. The treatments consisted of the following applications: glyphosate (180; 360; 540 and 720 g ha^-1); glyphosate in sequence (180/360; 360/360 and 540/360 g ha^-1); glyphosate+chlorimuronethyl (360+10; 540+10 and 360+5/360+5 g ha^-1); glyphosate+lactofen (360+120; 540+120 and 360+60/360+60 g ha^-1); glyphosate+cloransulam-methyl (360+30; 540+30 and 360+16,9/360+12,9 g ha^-1); glyphosate+carfentrazone (360+4 g ha^-1); glyphosate+imazethapyr (360+50 g ha^-1); glyphosate+imazethapyr (177.8+30 g ha^-1) and controls with and without weeding. Despite the similarity in grain yield between treatments with glyphosate alone and sequentially at doses 540, 720 and 540/360 g ha^-1, the tank mixtures with chlorimuron-ethyl, cloransulam-methyl, lactofen and imazethapyr favored control of weed species tolerant to glyphosate such as C. benghalensis and T. procumbens..

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