Differential Growth Responses of Marine Phytoplankton to Herbicide Glyphosate

Lin, Xin; Li, Ling; Lin, Senjie

doi:10.1371/journal.pone.0151633

Cited by 58 publications

(57 citation statements)

References 83 publications

(81 reference statements)

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“…To the best of our knowledge, this phenomenon has never been described in M. commoda , and the most parsimonious explanation remains that this eukaryotic alga can hydrolyze and grow on phosphonates. The reduction in cellular P content in M. commoda grown on MPN, as was seen Trichodesmium (White et al ), coupled with the demonstrated ability of several eukaryotic phytoplankton to use a chemically synthesized phosphonate as a P source (Wang et al ), strongly supports the notion of enzymatic phosphonate utilization.…”

Section: Resultsmentioning

confidence: 84%

Phosphonate utilization by eukaryotic phytoplankton

Whitney

Lomas

2018

Limnol Oceanogr Letters

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Phytoplankton readily assimilate dissolved inorganic phosphorus (phosphate; Pi) into essential biomolecules, making it their preferred form of phosphorus (P). In low Pi marine environments, phytoplankton also utilize dissolved organic P (DOP) compounds to sustain primary productivity. Phosphonates comprise up to 10% of the DOP pool and have been shown to be an important source of P in the nutrition of marine prokaryotic phytoplankton. To date, the ability of eukaryotic phytoplankton to supplement growth with natural phosphonates remains unknown. Here, we show that the growth rates of two eukaryotic phytoplankton species grown on phosphonate(s) as the sole source of P were significantly greater than growth rates under Pi‐deficient conditions. Phosphonate did not support growth of a third species, indicating utilization is not universal among eukaryotic phytoplankton. Taken together, these results indicate that direct uptake and utilization of extracellular phosphonates may no longer be restricted to the realm of prokaryotes.

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Section: Resultsmentioning

confidence: 84%

Phosphonate utilization by eukaryotic phytoplankton

Whitney

Lomas

2018

Limnol Oceanogr Letters

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“…; Wang et al . ). However, such ecological impacts remain relatively poorly understood, and warrant further investigation.…”

Section: Glyphosate and Phosphorus: Accumulation Transport And Bioamentioning

confidence: 97%

“…Many algal species can also use glyphosate as a source of P (Wang et al . ), with some taxa being naturally tolerant to the herbicide (eg several strains of cyanobacteria; Forlani et al . ; Harris and Smith ).…”

Section: Glyphosate and Phosphorus: Accumulation Transport And Bioamentioning

confidence: 99%

The overlooked impact of rising glyphosate use on phosphorus loading in agricultural watersheds

Hébert

Fugère

Gonzalez

2018

Frontiers in Ecol & Environ

121

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Glyphosate is the most extensively used pesticide worldwide. In addition to raising ecotoxicological concerns, the use of glyphosate adds phosphorus (P) to agricultural landscapes, influencing the accumulation and cycling of P in soil and nearby surface waters. Yet pesticides have been largely ignored when monitoring anthropogenic sources of P in agricultural watersheds. Estimating the supply of P derived from glyphosate use, both globally and in the US alone, we show that trends have markedly increased over the past two decades. Across the US, mean inputs of glyphosate‐derived P increased from 1.6 kg P km−2 in 1993 to 9.4 kg P km−2 in 2014, with values frequently exceeding 20 kg P km−2 in areas planted with glyphosate‐resistant crops. Although still a minor source of P relative to fertilizers, P inputs from glyphosate use have now reached levels comparable to those from sources for which P regulations were initiated in the past. We thus argue for greater recognition of glyphosate's influence on P flow in watershed research and management.

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“…Algal and cyanobacterial tolerance to glyphosate can vary among the species, but phytoplankton are generally considered tolerant to this herbicide (Wong, 2000;Tsui and Chu, 2003;Arunakumara et al, 2013;Wang et al, 2016). Glyphosate and AMPA have been shown to be degraded by cyanobacteria activity in aqueous environments (as reviewed by Arunakumara et al, 2013), and glyphosate mineralization could be related to the low glyphosate sensitivity of phytoplankton.…”

Section: Case Of Glyphosate and Temperaturementioning

confidence: 99%

“…These observations suggest that glyphosate exposure may affect photosynthetic aquatic organism communities, possibly by a glyphosate herbicidal mode of action or through glyphosate mineralization. Additionally, the growth of species able to degrade glyphosate and AMPA may be stimulated, as glyphosate mineralization represents a potential source of nutritional phosphorus and nitrogen (Widenfalk et al, 2008;Wang et al, 2016).…”

Section: Case Of Glyphosate and Temperaturementioning

confidence: 99%

Temperature and Light Modulation of Herbicide Toxicity on Algal and Cyanobacterial Physiology

Gomes

Juneau

2017

Front. Environ. Sci.

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HIGHLIGHTS• We reviewed the interaction between light, temperature and herbicides on algal and cyanobacterial physiology.• Temperature is the main factor affecting herbicide toxicity to algae and cyanobacteria.• Changes in light environment may modulate the effects of photosynthesis-targeting herbicides.Important interactions between climatic parameters and herbicide toxicity have been discussed in the literature. As climate changes are expected to influence the growth conditions of aquatic photosynthetic organisms over the next century by modifying the physicochemical parameters of the environment (such as temperature and incident light characteristics), the following questions arise: How will variations in climatic conditions influence herbicide toxicity in algae and cyanobacteria? Are these coupled effects on aquatic photosynthetic organism physiology antagonistic, additive, or synergistic?We discuss here the physiological responses of algae and cyanobacteria to the combined effects of environmental changes (temperature and light) and herbicide exposure. Both temperature and light are proposed to influence herbicide toxicity through acclimation processes that are mainly related to cell size and photosynthesis. Algal and cyanobacterial responses to interactions between light, temperature, and herbicides are species-specific, making it difficult today to establish a single model of how climate changes will affect toxicity of herbicides. Acclimation processes could assure the maintenance of primary production but total biodiversity should decrease in communities exposed to herbicides under changing temperature and light conditions. The inclusion of considerations on the impacts of environmental changes on toxicity of herbicides in water quality guidelines directed toward protecting aquatic life is now urgently needed.Keywords: environment, toxicity, hazardous, pollutants, algae, cyanobacteria Gomes and JuneauHerbicides/Climate Changes on PhytoplanktonGraphical Abstract | Changes in temperature and light conditions in water systems over the next century will drive physiological responses of algal and cyanobacterial community to herbicides, by antagonistic, additive, or synergic effects with these pollutants.

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Differential Growth Responses of Marine Phytoplankton to Herbicide Glyphosate

Cited by 58 publications

References 83 publications

Phosphonate utilization by eukaryotic phytoplankton

Phosphonate utilization by eukaryotic phytoplankton

The overlooked impact of rising glyphosate use on phosphorus loading in agricultural watersheds

Temperature and Light Modulation of Herbicide Toxicity on Algal and Cyanobacterial Physiology

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