Zum Wirkungsmechanismus des HerbizidsN-(Phosphonomethyl)glycin. Einfluß vonN-(Phosphonomethyl)glycin auf das Wachstum und auf die Enzyme der Aromatenbiosynthese vonEscherichia coli

Roisch, Uta; Lingens, Franz

doi:10.1515/bchm2.1980.361.2.1049

Cited by 29 publications

(4 citation statements)

References 16 publications

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“…Chan and Leung (1986) demonstrated that Environ Sci Pollut Res glyphosate affects the growth, respiration, and enzyme ity of the freshwater bacteria Pseudomonas chloraraphis and Aeromonas hydrophila. Glyphosate inhibits not only the activity of EPSP synthase but also that of deoxyheptonate aldolase and 3-dehydroquinate synthase, as well as Fe 2 + transport in several bacteria (Roisch and Lingens 1980). However, it should not be ruled out a possible indirect effect of glyphosate, through a top-down impact by protozooplankton who often presents differential predation on picoplankton.…”

Section: Discussionmentioning

confidence: 98%

Glyphosate input modifies microbial community structure in clear and turbid freshwater systems

Pizarro

Vera

Vinocur

et al. 2015

Environ Sci Pollut Res

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Since it was commercially introduced in 1974, glyphosate has been one of the most commonly used herbicides in agriculture worldwide, and there is growing concern about its adverse effects on the environment. Assuming that glyphosate may increase the organic turbidity of water bodies, we evaluated the effect of a single application of 2.4 ± 0.1 mg l(-1) of glyphosate (technical grade) on freshwater bacterioplankton and phytoplankton (pico, micro, and nanophytoplankton) and on the physical and chemical properties of the water. We used outdoor experimental mesocosms under clear and oligotrophic (phytoplanktonic chlorophyll a = 2.04 μg l(-1); turbidity = 2.0 NTU) and organic turbid and eutrophic (phytoplanktonic chlorophyll a = 50.3 μg l(-1); turbidity = 16.0 NTU) scenarios. Samplings were conducted at the beginning of the experiment and at 1, 8, 19, and 33 days after glyphosate addition. For both typologies, the herbicide affected the abiotic water properties (with a marked increase in total phosphorus), but it did not affect the structure of micro and nanophytoplankton. In clear waters, glyphosate treatment induced a trend toward higher bacteria and picoeukaryotes abundances, while there was a 2 to 2.5-fold increase in picocyanobacteria number. In turbid waters, without picoeukaryotes at the beginning of the experiment, glyphosate decreased bacteria abundance but increased the number of picocyanobacteria, suggesting a direct favorable effect. Moreover, our results show that the impact of the herbicide was observed in microorganisms from both oligo and eutrophic conditions, indicating that the impact would be independent of the trophic status of the water body.

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Section: Discussionmentioning

confidence: 98%

Glyphosate input modifies microbial community structure in clear and turbid freshwater systems

Pizarro

Vera

Vinocur

et al. 2015

Environ Sci Pollut Res

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“…Glyphosate may directly affect a crucial function other than aromatic amino acid synthesis in intact multicellular plants -a function necessary for plant growth that is not needed by unicellular systems. Apparently the effect of glyphosate on aromatic amino acid synthesis is by chelation of Co++ and Mg++, cofactors for enzymes involved in aromatic amino acid synthesis (30). Brecke and Duke (9) have shown that glyphosate rapidly reduces P0 4 +++ and Rb+ uptake by isolated bean leaf cells.…”

Section: Controlmentioning

confidence: 99%

Effects of Glyphosate on the Metabolism of Phenolic Compounds: VII. Root-Fed Amino Acids and Glyphosate Toxicity in Soybean (Glycine max) Seedlings

Duke¹,

Hoagland²

1981

Weed sci.

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Several regimes of supplying exogenous aromatic amino acids to intact, 3-day-old, soybean [Glycine max(L.) Merr. ‘Hill’] seedlings by root uptake were tested to determine if growth retardation caused by root-fed, 0.5 mM glyphosate [N-(phosphonomethyl) glycine] could be reversed. Generally, root-fed levels of aromatic amino acids just below growth-retarding levels (e.g. 1 mM phenylalanine + 0.1 mM tyrosine) reversed root growth inhibition caused by glyphosate to a small (ca. 10%) but significant extent. Feeding aromatic amino acids for 1 to 3 days before glyphosate exposure did not enhance the reversal. Uptake and metabolism of root-fed, aromatic amino acids in control and glyphosate-treated plants were verified by increased levels of hydroxyphenolic compounds (end products of aromatic amino acid metabolism) and by uptake and incorporation of14C-labeled phenylalanine and tyrosine. On a fresh weight basis, glyphosate had no inhibitory effect on uptake or incorporation of these amino acids into protein or secondary phenolic compounds. After 3 days of exposure, glyphosate had no substantial effects on shikimate dehydrogenase activity in control or aromatic amino acid-fed seedlings. These data suggest that either root-fed aromatic amino acids are compartmentalized differently than the endogenous pools affected by glyphosate or that root-fed glyphosate exerts most of its effect on growth of soybean seedlings through means other than inhibition of aromatic amino acid synthesis.

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“…In addition to treatments, baking quality traits were also impacted by cultivar and location, and as previously explained this could be due to changes in protein quality that is caused by genotypic and environmental effects. As Roisch and Lingens [19] and Gélinas et al [62] reported, glyphosate does not have a significant impact on yeast activity, and this may be the reason why most baking quality traits were not significantly affected by glyphosate.…”

Section: Effect Of Glyphosate On Baking Qualitymentioning

confidence: 96%

“…Braconi et al [18] also observed that glyphosate could impact wine fermentation due to interactions with yeast. However, Roisch and Lingens [19] indicated that glyphosate does not affect the synthesis of aromatic amino acids in baker's yeast at levels of 2 mmol l −1 . Given this evidence, it is possible that glyphosate could impact the fermentation that occurs during bread production, leading to decreases in baking quality of wheat flour.…”

Section: Introductionmentioning

confidence: 99%

Effects of Pre-Harvest Glyphosate Application on Spring Wheat Quality Characteristics

et al. 2020

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This study was conducted to determine the effect of pre-harvest glyphosate application on spring wheat quality characteristics, ranging from kernel quality to baking quality. Two wheat cultivars were grown in three locations, and glyphosate was applied at the recommended rate at the soft dough stage (early application) and the ripe stage (recommended application time). When glyphosate was applied at the soft dough stage, kernel weight, wheat protein and wet gluten decreased significantly (p ≤ 0.05), however, gluten index significantly increased (p ≤ 0.05). Dough quality, farinograph stability, and quality number were significantly (p ≤ 0.05) higher when glyphosate was applied at the soft dough stage, and absorption and the mixing tolerance index were lower. As for baking quality, loaf volume and mix time were significantly (p ≤ 0.05) higher in the treated samples in comparison to the untreated control, and other baking quality characteristics did not show any significant difference. Overall, the results indicate that spring wheat quality characteristics are impacted to the greatest degree when glyphosate is applied earlier than recommended at the soft dough stage, as opposed to the recommended application at the ripe stage of physiological development.

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Zum Wirkungsmechanismus des HerbizidsN-(Phosphonomethyl)glycin. Einfluß vonN-(Phosphonomethyl)glycin auf das Wachstum und auf die Enzyme der Aromatenbiosynthese vonEscherichia coli

Cited by 29 publications

References 16 publications

Glyphosate input modifies microbial community structure in clear and turbid freshwater systems

Glyphosate input modifies microbial community structure in clear and turbid freshwater systems

Effects of Glyphosate on the Metabolism of Phenolic Compounds: VII. Root-Fed Amino Acids and Glyphosate Toxicity in Soybean (Glycine max) Seedlings

Effects of Pre-Harvest Glyphosate Application on Spring Wheat Quality Characteristics

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