Mechanism of resistance to glyphosate in <i>Lolium perenne</i> from Argentina

dc.creatorYanniccari, Marcos
dc.creatorGómez Lobato, María Eugenia
dc.creatorIstilart, Carolina
dc.creatorNatalucci, Claudia Luisa
dc.creatorGiménez, Daniel Oscar
dc.creatorCastro, Ana María
dc.date2017
dc.date2019-12-17T17:43:11Z
dc.date.accessioned2023-07-14T17:41:22Z
dc.date.available2023-07-14T17:41:22Z
dc.identifierhttp://sedici.unlp.edu.ar/handle/10915/87593
dc.identifierissn:2296-701X
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7428453
dc.descriptionIn Argentina, glyphosate resistance was reported in a <i>Lolium perenne</i> population after 12 years of successful herbicide use. The aim of the current paper was to put in evidence for the mechanism of glyphosate resistance of this weed. Susceptible leaves treated with different doses of glyphosate and incubated <i>in vitro</i> showed an accumulation of shikimic acid of around three to five times the basal level, while no changes were detected in leaves of glyphosate-resistant plants. The resistance mechanism prevents shikimate accumulation in leaves, even under such tissue-isolation conditions. The activity of the glyphosate target enzyme (EPSPS: 5-enolpyruvylshikimate-3-phosphate synthase) was quantified at different herbicide concentrations. EPSPS from resistant plants showed no difference in glyphosate-sensitivity compared to EPSPS from susceptible plants, and, accordingly, no amino acid substitution causing mutations associated with resistance were found. While the glyphosate target enzymes were equally sensitive, the basal EPSPS activity in glyphosate resistant plants was approximately 3-fold higher than the EPSPS activity in susceptible plants. This increased EPSPS activity in glyphosate resistant plants was associated with a 15-fold higher expression of EPSPS compared with susceptible plants. Therefore, the over-expression of EPSPS appears to be the main mechanism responsible for resistance to glyphosate. This mechanism has a constitutive character and has important effects on plant fitness, as recently reported.
dc.descriptionInstituto de Fisiología Vegetal
dc.descriptionFacultad de Ciencias Agrarias y Forestales
dc.descriptionCentro de Investigación de Proteínas Vegetales
dc.formatapplication/pdf
dc.languageen
dc.rightshttp://creativecommons.org/licenses/by/4.0/
dc.rightsCreative Commons Attribution 4.0 International (CC BY 4.0)
dc.subjectCiencias Agrarias
dc.subjectCiencias Exactas
dc.subjectEPSPS activity
dc.subjectEPSPS overexpression
dc.subjectGlyphosate resistance
dc.subjectPerennial ryegrass
dc.subjectShikimate assay
dc.titleMechanism of resistance to glyphosate in <i>Lolium perenne</i> from Argentina
dc.typeArticulo
dc.typeArticulo


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