Glyphosate-Dependent Inhibition of Photosynthesis in Willow

Gomes, Marcelo P.; Le Manac’h, Sarah G.; Hénault-Ethier, Louise; Labrecque, Michel; Lucotte, Marc et Juneau, Philippe (2017). « Glyphosate-Dependent Inhibition of Photosynthesis in Willow ». Frontiers in Plant Science, 8(207).

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Résumé

We studied the physiological mechanisms involved in the deleterious effects of a glyphosate-based herbicide (Factor® 540) on photosynthesis and related physiological processes of willow (Salix miyabeana cultivar SX64) plants. Sixty-day-old plants grown under greenhouse conditions were sprayed with different rates (0, 1.4, 2.1, and 2.8 kg a.e ha-1) of the commercial glyphosate formulated salt Factor® 540. Evaluations were performed at 0, 6, 24, 48, and 72 h after herbicide exposure. We established that the herbicide decreases chlorophyll, carotenoid and plastoquinone contents, and promotes changes in the photosynthetic apparatus leading to decreased photochemistry which results in hydrogen peroxide (H2O2) accumulation. H2O2 accumulation triggers proline production which can be associated with oxidative protection, NADP+ recovery and shikimate pathway stimulation. Ascorbate peroxidase and glutathione peroxidase appeared to be the main peroxidases involved in the H2O2 scavenging. In addition to promoting decreases of the activity of the antioxidant enzymes, the herbicide induced decreases in ascorbate pool. For the first time, a glyphosate-based herbicide mode of action interconnecting its effects on shikimate pathway, photosynthetic process and oxidative events in plants were presented.

Type:	Article de revue scientifique
Informations complémentaires:	Copyright © 2017 Gomes, Le Manac’h, Hénault-Ethier, Labrecque, Lucotte and Juneau. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
Mots-clés ou Sujets:	Herbicide, oxidative stress, photosynthesis, proline, shikimate, willow
Unité d'appartenance:	Faculté des sciences > Département des sciences de la Terre et de l'atmosphère Instituts > Institut des sciences de l'environnement (ISE)
Déposé par:	Marc Michel Lucotte
Date de dépôt:	29 mars 2017 07:42
Dernière modification:	29 août 2017 12:50
Adresse URL :	http://archipel.uqam.ca/id/eprint/9528

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