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Effects of EPSPS Copy Number Variation (CNV) and glyphosate application on the aromatic and branched chain amino acid synthesis pathways in Amaranthus palmeri

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dc.contributor.authorFernández Escalada, Manuel
dc.contributor.authorZulet González, Ainhoa
dc.contributor.authorGil Monreal, Miriam
dc.contributor.authorZabalza Aznárez, Ana
dc.contributor.authorRavet, Karles_ES
dc.contributor.authorGaines, Toddes_ES
dc.contributor.authorRoyuela Hernando, Mercedes
dc.contributor.departmentCiencias del Medio Naturales_ES
dc.contributor.departmentNatura Ingurunearen Zientziakeu
dc.contributor.funderUniversidad Pública de Navarra / Nafarroako Unibertsitate Publikoaes
dc.date.accessioned2017-11-17T08:32:36Z
dc.date.available2017-11-17T08:32:36Z
dc.date.issued2017
dc.description.abstractA key enzyme of the shikimate pathway, 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS; EC 2.5.1.19), is the known target of the widely used herbicide glyphosate. Glyphosate resistance in Amaranthus palmeri, one of the most troublesome weeds in agriculture, has evolved through increased EPSPS gene copy number. The aim of this work was to study the pleiotropic effects of (i) EPSPS increased transcript abundance due to gene copy number variation (CNV) and of (ii) glyphosate application on the aromatic amino acid (AAA) and branched chain amino acid (BCAA) synthesis pathways. Hydroponically grown glyphosate sensitive (GS) and glyphosate resistant (GR) plants were treated with glyphosate 3 days after treatment. In absence of glyphosate treatment, high EPSPS gene copy number had only a subtle effect on transcriptional regulation of AAA and BCAA pathway genes. In contrast, glyphosate treatment provoked a general accumulation of the transcripts corresponding to genes of the AAA pathway leading to synthesis of chorismate in both GS and GR. After chorismate, anthranilate synthase transcript abundance was higher while chorismate mutase transcription showed a small decrease in GR and remained stable in GS, suggesting a regulatory branch point in the pathway that favors synthesis toward tryptophan over phenylalanine and tyrosine after glyphosate treatment. This was confirmed by studying enzyme activities in vitro and amino acid analysis. Importantly, this upregulation was glyphosate dose dependent and was observed similarly in both GS and GR populations. Glyphosate treatment also had a slight effect on the expression of BCAA genes but no general effect on the pathway could be observed. Taken together, our observations suggest that the high CNV of EPSPS in A. palmeri GR populations has no major pleiotropic effect on the expression of AAA biosynthetic genes, even in response to glyphosate treatment. This finding supports the idea that the fitness cost associated with EPSPS CNV in A. palmeri may be limited.en
dc.description.sponsorshipMF-E, AZ-G, and MG-M received funding from fellowships trough Universidad Pública de Navarra. This work was financially supported by a grant from the Ministerio Español de Economía y Competitividad (AGL-2016-77531R). This work was also partially financially supported by the USDA National Institute of Food and Agriculture, Hatch project COL00719 to the Colorado State University Agricultural Experiment Station.en
dc.format.mimetypeapplication/pdfen
dc.identifier.doi10.3389/fpls.2017.01970
dc.identifier.urihttps://academica-e.unavarra.es/handle/2454/26196
dc.language.isoengen
dc.publisherFrontiers Mediaen
dc.relation.ispartofFrontiers in Plant Science, 16 November 2017en
dc.relation.projectIDinfo:eu-repo/grantAgreement/ES/1PE/AGL2016-77531en
dc.relation.publisherversionhttps://doi.org/10.3389/fpls.2017.01970
dc.rightsCopyright © 2017 Fernández-Escalada, Zulet-González, Gil-Monreal, Zabalza, Ravet, Gaines and Royuela. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY).en
dc.rights.accessRightsAcceso abierto / Sarbide irekiaes
dc.rights.accessRightsinfo:eu-repo/semantics/openAccessen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectGlyphosateen
dc.subjectAromatic amino acid pathwayen
dc.subjectBranched chain amino acid pathwayen
dc.subjectmRNA relative expressionen
dc.subjectEPSPSen
dc.subjectCMen
dc.subjectASen
dc.subjectAmaranthus palmerien
dc.titleEffects of EPSPS Copy Number Variation (CNV) and glyphosate application on the aromatic and branched chain amino acid synthesis pathways in Amaranthus palmeries_ES
dc.typeArtículo / Artikuluaes
dc.typeinfo:eu-repo/semantics/articleen
dc.type.versionVersión publicada / Argitaratu den bertsioaes
dc.type.versioninfo:eu-repo/semantics/publishedVersionen
dspace.entity.typePublication
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relation.isAuthorOfPublicatione9c604fa-a610-4c8b-81fd-f9352c2c8601
relation.isAuthorOfPublicationb62dd25b-6298-44fe-8690-12267f5b3d70
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relation.isAuthorOfPublication.latestForDiscoverye92ef4c3-70e2-4e1d-bc9a-b3e31397085f

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