Ecotoxicological assessment of soil microbial community tolerance to glyphosate

Allegrini, Marco; Zabaloy, María Celina; Gómez, Emma Laura Alfaro

doi:10.1016/j.scitotenv.2015.06.096

Cited by 47 publications

(39 citation statements)

References 43 publications

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“…This result can be explained by the accumulation of the glyphosate, which make the medium toxic. Thus, several studies have reported the eco-toxicity of glyphosate on specific soil microorganisms (Allegrini et al, 2015;Sihtmäe et al, 2013). On the other hand, according to the study made by (Ahemad et al, 2012), the glyphosate affects negatively the growth of Mesorhizobium strain MRC4, these results are consistent with those obtained for Rhizobium tibeticum strain, as well as those of who claimed that none of the two Achromobacter sp.…”

Section: Resultssupporting

confidence: 85%

Assessment of the resistance of four nitrogen-fixing Bacteria to glyphosate

Ibijbijen

Maldani

Messaoud

et al. 2018

AJB

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The presence of residual pesticides in the soil affect the microbial Communities, as well the continuous use of pesticides exacerbates this problem. Glyphosate is one of the most used herbicides in the world. Up to date several studies have evaluated the tolerance and resistance of bacteria to glyphosate. Nitrogen-fixing bacteria play an important role in soil fertility; thus, the alteration of these bacterial communities decrease soil fertility. The objective of this study was to evaluate the effect of glyphosate application on four bacterial strains Pantoea agglomerans, Rhizobium nepotum, Rhizobium radiobacter, and Rhizobium tibeticum. Glyphosate was applied as the sole source of carbon at the rate (0 g/l, 0.5 g/l, 1g/l, 3g/l, 6g/l and 12 g/l) with two methods. Microbial growth was measured by the Colony Forming Units (CFUs /ml) method. Comparing with the control, our results showed that the growth of the four strains decreased by increasing the concentration of glyphosate. The four strains have shown resistance to glyphosate in the direct enrichment compared to the continued enrichment method. Comparing strains with each other, Rhizobium radiobacter is the most resistant strain to glyphosate.

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Section: Resultssupporting

confidence: 85%

Assessment of the resistance of four nitrogen-fixing Bacteria to glyphosate

Ibijbijen

Maldani

Messaoud

et al. 2018

AJB

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“…Nweke et al (2014) reported hormetic effects of glyphosate at low doses on the dehydrogenase activity in pure culture of Rhizobium species. Stimulation of microbial activity following glyphosate application in soil has been a the slightly synergistic effect had TI value close to 1 and was taken to be additive; b the slightly antagonistic effect had TI value close to 1 and was taken to be additive reported (Araujo et al, 2003;Ratcliff et al, 2006;Partoazar et al, 2011;Allegrini et al, 2015). The stimulation of dehydrogenase activity at low doses of glyphosate could be attributed to possible use of glyphosate as carbon and energy source.…”

Section: Resultsmentioning

confidence: 99%

“…Several bacterial species have been demonstrated to grow on glyphosate and its biodegradation intermediate (Dick & Quinn, 1995;Gimsing et al, 2004;Moneke et al, 2010). Thus, the observed hormesis could be due to increase in respiration response at low concentrations due to sarcosine, an intermediate of glyphosate biodegradation (Allegrini et al, 2015). In addition, it could be a stress response in glyphosate sensitive species at low concentrations due to the "energy drain" resulting from the ATP used in the accumulation of shikimate and hydroxybenzoic acids (Zabaloy et al, 2012).…”

Section: Resultsmentioning

confidence: 99%

Toxicity of Quaternary Mixtures of Phenolic Compounds and Formulated Glyphosate to Microbial Community of River Water

Nweke

Ike

Ibegbulem

2024

Ecotoxicol. Environ. Contam.

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The toxicity of mixtures of formulated glyphosate, phenol, 4-chlorophenol and 2,4-dichlorophenol to river water microbial community was investigated using non specific dehydrogenase activity as endpoint. The microbial community was exposed to individual toxicant and quaternary mixture ratios at concentrations ranging from 50 mg L -1 to 3000 mg L -1 over 24 h. The ecological doses (EC 50 ) as estimated from logistic or hormesis dose-effect models were 1317.946 ± 51.460 mg L -1 , 1046.414 ± 65.534 mg L -1 , 85.080 ± 4.468 mg L -1 and 60.897 ± 5.199 mg L -1 for formulated glyphosate, phenol, 4-chlorophenol and 2,4-dichlorophenol respectively. The toxicity and interaction of the mixtures were evaluated using concentration addition and toxic index models. The model deviation ratios (MDR) ranged from 0.553 ± 0.024 to 1.096 ± 0.021 while the toxic index (TI) varied between 0.912 ± 0.017 and 1.810 ± 0.078. However, the MDR and TI for all mixtures lie between 0.5 and 2.0. Thus, the joint action of the mixtures were considered additive.

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“…Readings were obtained from the plate at 24, 48 and 72 h (Wallac 1420 Victor2 multi-label counter, Perkin Elmer Life Sciences). Readings at each time point (relative fluorescence units, RFU) were plotted vs. time (hours) to obtain respiratory curves (Allegrini et al, 2015). The integrated area under respiratory curve (AUC) was calculated between 24 and 72 h with the software SigmaPlot 10.0 (Systat Software, Inc., San Jose, CA, USA).…”

Section: Community-level Physiological Profiles (Clpp)mentioning

confidence: 99%

“…This suggests an increase in catabolic diversity when a legume species such as vetch is included in the mixture, probably linked to a major provision of N in the soil, which may be associated with an enhance of microbial growth (Garland et al, 2012). A further analysis of AUC using BD oxygen biosensor system (BDOBS-CLPP) would be interesting to fully understand functional diversity through C sources consumption as explained by Allegrini et al (2015).…”

Section: Microbial Respiration and Soil Enzyme Activitiesmentioning

confidence: 99%

Soil microbial functionality in response to the inclusion of cover crop mixtures in agricultural systems

Chavarría

Verdenelli

Muñoz

et al. 2016

Span. j. agric. res.

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Agricultural systems where monoculture prevails are characterized by fertility losses and reduced contribution to ecosystem services. Including cover crops (CC) as part of an agricultural system is a promising choice in sustainable intensification of those demanding systems. We evaluated soil microbial functionality in cash crops in response to the inclusion of CC by analyzing soil microbial functions at two different periods of the agricultural year (cash crop harvest and CC desiccation) during 2013 and 2014. Three plant species were used as CC: oat (Avena sativa L.), vetch (Vicia sativa L.) and radish (Raphanus sativus L.) which were sown in two different mixtures of species: oat and radish mix (CC1) and oat, radish and vetch mix (CC2), with soybean monoculture and soybean/corn being the cash crops. The study of community level physiological profiles showed statistical differences in respiration of specific C sources indicating an improvement of catabolic diversity in CC treatments. Soil enzyme activities were also increased with the inclusion of CC mixtures, with values of dehydrogenase activity and fluorescein diacetate hydrolysis up to 38.1% and 35.3% higher than those of the control treatment, respectively. This research evidenced that CC inclusion promotes soil biological quality through a contribution of soil organic carbon, improving the sustainability of agrosystems. The use of a CC mixture of three plant species including the legume vetch increased soil biological processes and catabolic diversity, with no adverse effects on cash crop grain yield.

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Ecotoxicological assessment of soil microbial community tolerance to glyphosate

Cited by 47 publications

References 43 publications

Assessment of the resistance of four nitrogen-fixing Bacteria to glyphosate

Assessment of the resistance of four nitrogen-fixing Bacteria to glyphosate

Toxicity of Quaternary Mixtures of Phenolic Compounds and Formulated Glyphosate to Microbial Community of River Water

Soil microbial functionality in response to the inclusion of cover crop mixtures in agricultural systems

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