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Impact of phosphate on glyphosate uptake and toxicity in willow

By Marcelo Pedrosa Gomes, Sarah Gingras Le Manac’h, Matthieu Moingt, Elise Smedbol, Serge Paquet, Michel Labrecque, Marc Lucotte and Philippe Juneau

Abstract

Phosphate (PO4 3-) has been shown to increase glyphosate uptake by willow, a plant species known for its phytoremediation potential. However, it remains unclear if this stimulation of glyphosate uptake can result in an elevated glyphosate toxicity to plants (which could prevent the use of willows in glyphosate-remediation programs). Consequently, we studied the effects of PO4 3- on glyphosate uptake and toxicity in a fast growing willow cultivar (Salix miyabeana\ud SX64). Plants were grown in hydroponic solution with a combination of glyphosate (0, 0.001, 0.065 and 1 mg l-1) and PO4 3- (0, 200 and 400 mg l-1). We demonstrated that PO4 3- fertilization greatly increased glyphosate uptake by roots and its translocation to leaves, which resulted in increased shikimate concentration in leaves. In addition to its deleterious effects in photosynthesis, glyphosate induced oxidative stress through hydrogen peroxide accumulation. Although it has increased glyphosate accumulation, PO4 3- fertilization attenuated the herbicide’s deleterious effects by increasing the activity of antioxidant systems and alleviating glyphosateinduced oxidative stress. Our results indicate that in addition to the glyphosate uptake, PO4 3- is involved in glyphosate toxicity in willow by preventing glyphosate induced oxidative stress

Topics: Antioxidant enzymes, Fertilization, Herbicide, Phosphorus, Photosynthesis
Year: 2016
DOI identifier: 10.1016/j.jhazmat.2015.10.043
OAI identifier: oai:www.archipel.uqam.ca:7574

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