INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE
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Lax Panicgrass (Steinchisma laxum) is a monocot weed in the Poaceae family. In Mexico this weed first evolved resistance to Group 9 (Legacy G) herbicides in 2023 and infests Rice. 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.
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Common Name | Lax Panicgrass | Species | Steinchisma laxum | Group | Inhibition of Enolpyruvyl Shikimate Phosphate Synthase
HRAC Group 9 (Legacy G)
| Herbicides | glyphosate | Location | Mexico, Central zone and Llanos plains | Year | 2023 | Situation(s) | Rice | Contributors - (Alphabetically) | Rafael De Prado, Ian Heap, Veronica Hoyos, Candelario Palma-Bautista, and Guido Plaza | |
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| Rafael De Prado | Divergence in glyphosate susceptibility between Steinchisma laxum populations involves a Pro106Ser mutation.
Author(s) : Hoyos, V. ; Plaza, G. ; Palma-Bautista, C. ; Vázquez-García, J. G. ; Dominguez-Valenzuela, J. A. ; Alcántara-De Cruz, R. la ; Prado, R. de
Author Affiliation : Departamento de Ciencias Biológicas, Universidad Nacional de Colombia, Palmira 763533, Colombia.
Author Email : ricardo.cruz@ufscar.br
Journal article : Plants 2023 Vol.12 No.18 ref.46
Abstract : The characterization of the mechanisms conferring resistance to herbicides in weeds is essential for developing effective management programs. This study was focused on characterizing the resistance level and the main mechanisms that confer resistance to glyphosate in a resistant (R) Steinchisma laxum population collected in a Colombian rice field in 2020. The R population exhibited 11.2 times higher resistance compared to a susceptible (S) population. Non-target site resistance (NTSR) mechanisms that reduced absorption and impaired translocation and glyphosate metabolism were not involved in the resistance to glyphosate in the R population. Evaluating the target site resistance mechanisms by means of enzymatic activity assays and EPSPS (5-enolpyruvylshikimate-3-phosphate synthase) gene sequencing, the mutation Pro106Ser was found in R plants of S. laxum. These findings are crucial for managing the spread of S. laxum resistance in Colombia. To effectively control S. laxum in the future, it is imperative that farmers use herbicides with different mechanisms of action in addition to glyphosate and adopt Integrate Management Programs to control weeds in rice fields of the central valleys of Colombia. ISSN : 2223-7747 DOI : 10.3390/plants12183315 Edit this Note | Add New Note |
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| Greenhouse, and Laboratory trials comparing a known susceptible Lax Panicgrass biotype with this Lax Panicgrass biotype have been used to confirm resistance. For further information on the tests conducted please contact the local weed scientists that provided this information. |
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| Genetic studies on HRAC Group 9 resistant Lax Panicgrass 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 |
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| Studies on the mechanism of resistance of Group 9 (Legacy G) resistant Lax Panicgrass from Mexico 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 |
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| 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 Lax Panicgrass from Mexico please update the database. |
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| Universidad De Cordoba Qvimica Agricola Y Edafologa E T S Ingenieros Agronomos PO Box 119 Cordoba, E-14080, Andalusia Spain Email Rafael De Prado |
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| Director International Survey of Herbicide-Resistant Weeds Qvimica Agricola Y Edafologa E T S Ingenieros Agronomos P.O. Box 1365 Corvallis, 97339, Oregon United States Email Ian Heap Web : Web Site Link |
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| Investigador Posdoctoral Universidad Autónoma Chapingo Departamento de Parasitología Agrícola Campus Central Carretera México – Texcoco Km 38.5 Texcoco, México CP 56230 Texcoco, 56230, Estado de México Mexico Email Candelario Palma-Bautista Web : Web Site Link |
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| Associate Professor Universidad Nacional de Colombia Agronomy Department Carrera 30 45-03 Edificio 500 Of 236 Bogotá, 111321, Cundinamarca Colombia Email Guido Plaza Web : Web Site Link |
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Drag a column header and drop it here to group by that column |
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1
| Mexico | Mexico | | 2023 |
Rice
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glyphosate
| 29 |
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase
( HRAC Group 9 (Legacy G)
| 1358 | Steinchisma laxum | Lax Panicgrass | 27271 |
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PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site. Citation:
Heap, I. The International Herbicide-Resistant Weed Database. Online.
. Available
www.weedscience.org
Copyright © 1993-
WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.
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