Glyphosate Susceptibility of Different Life Stages of Three Fern Species

Aguilar-Dorantes, Karla María; Mehltreter, Klaus; Mata-Rosas, Martín; Vibrans, Heike; Esqueda-Esquivel, Valentín A.

doi:10.1640/0002-8444-105.3.131

Cited by 10 publications

(5 citation statements)

References 33 publications

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“…Reviewing current studies, the European Food Safety Authority Panel on Plant Protection Products (2014) concluded that reproductive endpoints, in general, are more sensitive than vegetative measures. In addition, the stage at which plants are exposed can further influence the magnitude of the observed effects (Gilreath et al 2001; Riemens et al 2009; Griffin et al 2013; Aguilar‐Dorantes et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Effects of Herbicides on Flowering

Carpenter

Mathiassen

Boutin

et al. 2020

Enviro Toxic and Chemistry

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Herbicides have been shown to reduce flower production and to delay flowering, with results varying among herbicides and tested plant species. We investigated the effects of herbicides on flowering in an extensive greenhouse study conducted in Canada and Denmark. The effects of low doses of 5 different herbicides (bromoxynil, ioxynil + bromoxynil, metsulfuron‐methyl, clopyralid, and glyphosate), simulating realistic drift scenarios (1 and 5% recommended field rates), on plant flowering were examined using 9 wild plant species exposed at either the seedling (6‐ to 8‐leaf) or flower bud stage. Following herbicide exposure, initial flowering date as well as flower production over time were recorded over the growing period. The effect of herbicides on cumulative flower numbers and flowering time were modeled using Gompertz growth models. Significant delays to peak flowering and/or reductions in flower production were observed in at least one plant species for all tested herbicides, with glyphosate often exhibiting the greatest negative effects, that is, plant death. Except for ioxynil + bromoxynil, there was no clear evidence of either the seedling or the flower bud stage being more sensitive. Overall, 58% of all species × life stage × herbicide treatments resulted in either a statistically significant or a strong decline in flower production with herbicide application rates up to 5% of recommended field rates, whereas significant or strong delays in peak flowering were also detected but were slightly less common. Effects at 1% label rates were minimal. Simultaneous delays to peak flowering and reductions in total flower production occurred in approximately 25% of all cases, indicating that herbicide application rates simulating realistic drift scenarios would likely have negative effects on wild floral communities. Environ Toxicol Chem 2020;39:1244–1256. © 2020 SETAC

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Section: Introductionmentioning

confidence: 99%

Effects of Herbicides on Flowering

Carpenter

Mathiassen

Boutin

et al. 2020

Enviro Toxic and Chemistry

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“…Plant sensitivity to herbicides and the overall magnitudes of herbicide effects may vary depending on the phenological stage at the time of exposure (Gilreath et al 2001; Riemens et al 2009; Griffin et al 2013; Aguilar‐Dorantes et al 2015; Carpenter et al 2020), and responses can differ depending on whether vegetative or reproductive endpoints are assessed. Although plants are known to be very sensitive to herbicides at early growth stages, it has been demonstrated that reproductive endpoints are more sensitive measures of herbicide effects than vegetative vigor (=biomass) in more than 50% of the examined cases (Boutin et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Effects of Low Doses of Herbicides on Different Endpoints in the Life Cycle of Nontarget Terrestrial Plants

Mathiassen

Boutin

Strandberg

et al. 2021

Enviro Toxic and Chemistry

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Herbicide drift may cause adverse effects on natural and seminatural plant communities, and it has been debated whether the current ecological risk assessments are adequate to protect nontarget terrestrial plant species. In the present study, 9 nontarget terrestrial plant species with different lifespans (3 annual/6 perennial) belonging to 6 different plant families were exposed to 4 herbicides with different modes of action at the vegetative (6–8 leaf) and reproductive (bud) stages separately. The plant tests were conducted under controlled conditions in 2 greenhouses, 1 located in Denmark and 1 in Canada. For both growth stages, effects were recorded on vegetative (above‐ground biomass 3 wk after treatment) and reproductive endpoints (number and germinability of seeds). In most cases, responses following exposure at the juvenile stage were greater than responses following exposure at the reproductive stage. For the combinations of herbicides and plant species included in the present study, we found that the sensitivities of vegetative and reproductive endpoints were equal, or else vegetative endpoints were more sensitive than reproductive endpoints. We also found that annual species were more sensitive than perennial species. The overall conclusions cover many different response patterns, and it is evident that some effects may not be found in the currently used standard tests. Generally, more pronounced effects were obtained in Denmark compared with Canada, highlighting the fact that even under standardized test conditions and following common guidelines, several uncontrollable factors can still induce variable results. Environ Toxicol Chem 2021;40:1389–1404. © 2021 SETAC

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“…The effects of residual glyphosate on nontarget plants have been well studied for species of terrestrial ecosystems such as agricultural field edges, grasslands, or forests (Coupland and Lutman 1982; Marrs et al 1993; Power et al 2013; Boutin et al 2014; Damgaard et al 2014; Aguilar‐Dorantes et al 2015; Florencia et al 2017). From these studies it is apparent that glyphosate can cause phytotoxic effects in nontarget plants, although glyphosate sensitivity can vary among species and also among life stages of a species.…”

Section: Introductionmentioning

confidence: 99%

Glyphosate Toxicity to Native Nontarget Macrophytes Following Three Different Routes of Incidental Exposure

Sesin

Davy

Stevens

et al. 2020

Integr Envir Assess & Manag

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A major goal of invasive plant management is the restoration of native biodiversity, but effective methods for invasive plant control can be harmful to native plants. Informed application of control methods is required to reach restoration goals. The herbicide glyphosate, commonly applied in invasive plant management, can be toxic to native macrophytes. Our study assessed the response of 2 macrophytes that are endangered in our study area (Ammannia robusta and Sida hermaphrodita) to glyphosate concentrations that mimic incidental exposure from nearby invasive plant control: spray drift of 4 × 10−7% to 5% glyphosate; pulse and continuous immersion in water containing 2 to 41 µg/L glyphosate; and rhizosphere contact with 5%‐glyphosate‐wicked invasive plants. We assessed macrophyte sensitivity at 14‐d postexposure, and quantified abundance of arbuscular mycorrhizal fungi. Glyphosate spray concentrations as low as 0.1% reduced macrophyte growth. Ammannia was more sensitive overall to glyphosate spray than Sida, although sensitivity varied among measured endpoints. Conversely, macrophytes were not affected by immersion in low concentrations of glyphosate or rhizosphere contact with a glyphosate‐wicked plant. Likewise, arbuscular mycorrhizal fungi abundance in roots was similar among glyphosate‐sprayed and control plants. Based on our results, we recommend that invasive plant managers reduce risks to native nontarget plants through implementing measures that limit off‐target spray drift, and consider the feasibility of more targeted applications, such as with wick equipment. Integr Environ Assess Manag 2021;17:597–613. © 2020 The Authors. Integrated Environmental Assessment and Management published by Wiley Periodicals LLC on behalf of Society of Environmental Toxicology & Chemistry (SETAC)

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Glyphosate Susceptibility of Different Life Stages of Three Fern Species

Cited by 10 publications

References 33 publications

Effects of Herbicides on Flowering

Effects of Herbicides on Flowering

Effects of Low Doses of Herbicides on Different Endpoints in the Life Cycle of Nontarget Terrestrial Plants

Glyphosate Toxicity to Native Nontarget Macrophytes Following Three Different Routes of Incidental Exposure

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