Impact of phosphate on glyphosate uptake and toxicity in willow

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

doi:10.1016/j.jhazmat.2015.10.043

Cited by 59 publications

(26 citation statements)

References 53 publications

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“…Salix miyabeana cultivar SX64 was chosen for this study due to its high tolerance to stress factors, fast growth and great biomass production ( Labrecque and Teodorescu, 2005 ). Moreover, this species has been indicated for phytoremediation programs, particularly in the context of riparian buffer strips, to reclaim agricultural contaminants ( Gomes et al, 2016b ). Cuttings of S. miyabeana approximately 20 cm long were grown in plastic boxes (35 l) filled with distilled water amended with King Max nutrient solutions A (7% P 2 O 5 , 11% K 2 O, 1.5% Mg, 1.27% S, 0.07% B, 0.002% Mo, 0.12% Zn) and B (4% N, 1% NH 4 + , 3% NO 3 -2 , 10% K 2 O, 2% Ca, 0.05% Fe, 0.05% Mn) (Montreal, QC, Canada), following the product’s instructions.…”

Section: Methodsmentioning

confidence: 99%

Glyphosate-Dependent Inhibition of Photosynthesis in Willow

et al. 2017

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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.

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Section: Methodsmentioning

confidence: 99%

Glyphosate-Dependent Inhibition of Photosynthesis in Willow

et al. 2017

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“…In the second pathway, this cleavage is caused by a C-P lyase complex, leading to the release of purines and amino acids (Aparicio et al 2013). Although the amount of total phosphorus released by glyphosate through this C-P cleavage has been reported in the literature (Lipok et al 2007;Vera et al 2010;Vera et al 2014;Gomes et al 2016b), dissolved reactive phosphorus has never been considered. Our results showed that glyphosate releases a significant amount of phosphorus into surrounding waters, but that this phosphorus does not seem to be bioavailable to biofilms.…”

Section: Glyphosate Is a Source Of Phosphorus But Not In A Bioavailabmentioning

confidence: 99%

“…The phosphonate herbicide glyphosate, which is the active ingredient in Roundup ® , is currently the most widely used herbicide in the world (Vera et al 2010;Gomes et al 2014;Vera et al 2014;Gomes et al 2016aGomes et al , 2016b. In 2014, worldwide glyphosate use was 825 803 tons, 90.4% of which was used in an agricultural context (Benbrook 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Glyphosate is a broad spectrum, non-selective systemic herbicide (Vera et al 2010;Gomes et al 2016b). Its principal mode of action is the inhibition of the synthesis of the 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS), an enzyme involved in the biosynthesis of the essential aromatic amino acids phenylalanine, tyrosine, and tryptophan (Pérez et al 2007;Gomes et al 2014).…”

Section: Introductionmentioning

confidence: 99%

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Age matters: Submersion period shapes community composition of lake biofilms under glyphosate stress

Khadra

Planas

Girard

et al. 2018

FACETS

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The phosphonate herbicide glyphosate, which is the active ingredient in the commercial formulation Roundup®, is currently the most globally used herbicide. In aquatic ecosystems, periphytic biofilms, or periphyton, are at the base of food webs and are often the first communities to be in direct contact with runoff. Microcosm experiments were conducted to assess the effects of a pulse exposure of glyphosate on community composition and chlorophyll a concentrations of lake biofilms at different colonization stages (2 months, 1 year, and 20 years). This is the first study that uses such contrasting submersion periods. Biofilms were exposed to either environmental levels of pure analytical grade glyphosate (6 μg/L, 65 μg/L, and 600 μg/L) or to corresponding phosphorus concentrations. Community composition was determined by deep sequencing of the 18S and 16S rRNA genes to target eukaryotes and cyanobacteria, respectively. The results showed that submersion period was the only significant contributor to community structure. However, at the taxon level, the potentially toxic genus Anabaena was found to increase in relative abundance. We also observed that glyphosate releases phosphorus into the surrounding water, but not in a bioavailable form. The results of this study indicate that environmental concentrations of glyphosate do not seem to impact the community composition or metabolism of lake biofilms under pulse event conditions.

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“…; Bott et al, 2011], and may have negative impacts on the function of vegetative buffer strips (Gomes et al, 2015). Gomes et al (2016) reported enhanced root uptake of GPS in willow ( Salix spp.) by PO 4 application, although phytotoxic effects may be minimized due to increased antioxidant activity attributed to greater plant P assimilation.…”

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confidence: 99%

Interactions among Glyphosate and Phosphate in Soils: Laboratory Retention and Transport Studies

Padilla

Selim

2019

J of Env Quality

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The purpose of this study was to determine the effect of PO4 on the sorption and transport of glyphosate [N‐(phosphonomethyl) glycine, GPS] in soils. The results of batch experiments indicated significant competition between PO4 and GPS in two different soils, with PO4 being preferentially sorbed. The 24‐h Freundlich partitioning coefficients for GPS sorption were decreased by 50 to 60% with PO4 in solution. High sorptive capacities exhibited by soils in the presence of PO4 suggest the existence of both competitive and ion specific sites in either soil. Miscible displacement transport studies indicated limited effects of competition when GPS was applied in conjunction with or subsequent to pulses of PO4. However, when a PO4 pulse was applied after the application of a GPS pulse, a secondary GPS breakthrough was observed where an additional 4% of the applied herbicide mass was recovered in the effluent solution. This is likely attributed to the PO4–mediated displacement of GPS bound to competitive sites. These results are further emphasized by the distribution of residual herbicide in this column, with enrichment of mass at lower depths in the column and a corresponding decrease in GPS mass closer to the column surface. These results indicate that the timing of inorganic P fertilizers relative to GPS applications has a significant impact on the fate of the herbicide in soils. In particular, these findings suggest that GPS may be more liable to leaching in scenarios in which P fertilizers are applied after the application of GPS‐based herbicidal formulations. Core Ideas Sorption of glyphosate by soils is decreased in the presence of phosphate. Phosphate can displace soil‐bound glyphosate. Timing of phosphate application affects the mobility and fate of glyphosate in soils.

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Impact of phosphate on glyphosate uptake and toxicity in willow

Cited by 59 publications

References 53 publications

Glyphosate-Dependent Inhibition of Photosynthesis in Willow

Glyphosate-Dependent Inhibition of Photosynthesis in Willow

Age matters: Submersion period shapes community composition of lake biofilms under glyphosate stress

Interactions among Glyphosate and Phosphate in Soils: Laboratory Retention and Transport Studies

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