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Glyphosate (N-(phosphonomethyl)glycine) was developed in the early 1970s and at present is used as a herbicide to kill broadleaf weeds and grass. The widely occurring degradation product aminomethylphosphonic acid (AMPA) is a result of glyphosate and amino-polyphosphonate degradation. The massive use of the parent compound leads to the ubiquity of AMPA in the environment, and particularly in water.
Over the last few years, the importance of knowledge about pesticide’s persistence, mobility, and ecotoxicity has increased. Using pesticides and other agrochemicals is the most cost-effective way to maintain economic viability in the increasing human population [1][2]. On the other hand, the intensive application and repeated use of pesticides in fields in order to increase the crop yield lead to long-term risk for humans, fauna, flora, and the whole ecosystem (soil, air, and water) [1][2][3]. The extensive use of pesticides is not only a problem in agricultural areas but also in urban settings where pesticides are applied for horticultural purposes. Therefore, it is challenging to control the source of diffuse chemical pollution and its consequences [4]. In particular, the presence of pesticides and their metabolites occurring in residual concentratiosn in drinking, ground, and surface waters poses a global problem [1][3].
Directly after spraying herbicide in agriculture or in urban areas, glyphosate is absorbed by crops or weeds and penetrates the soil simultaneously. The glyphosate degradation pathway in bacterial strains is the cleavage of the C-N bond and conversion to AMPA, which is either further decomposed or excreted into the environment [5][6]. AMPA is a primary product of the degradation process of glyphosate and the following nontoxic products are sarcosine and glycine. Unlike AMPA, which is 3–6-fold times more toxic and persistent than glyphosate [7], sarcosine is barely detected in the natural environment [8], except under experimental conditions in a laboratory [6]. On the one hand, the soil has functioned as storage; on the other hand, these contaminants leach below the root zone into groundwater. Glyphosate is also transported by runoff into surface water and consequently accumulated in sediment where glyphosate can be highly mobile [9][7]. The residual concentrations of glyphosate and AMPA in waters contaminate aquatic organisms via the food web ( Figure 1 ) [10][5].
Species | Formulation | Exposure (Hours) | Concentration (mg/L) |
References |
---|---|---|---|---|
Rainbow trout (Oncorhynchus mykiss) |
GLY | 96 | 140 | [17] |
Roundup 1 | 96 | 52–55 | [22] | |
Common carp (Cyprinus carpio) |
GLY | 48 | 645 | [23] |
96 | 620 | |||
Roundup 1 | 96 | 22.19 | [24] | |
GLY | 48 | 602.61 | [25] | |
96 | 520.77 | |||
Blackhead minnow (Pimephales promelas) |
GLY | 96 | 97 | [17] |
Channel catfish (Ictalurus punctatus) |
96 | 130 | ||
Bluegills (Lepomis macrochirus) |
GLY | 24 | 150 | [17] |
96 | 140 | |||
Guppy (Poecilia reticulata) |
GLY | 96 | 69.83 | [26] |
Rhamdia quelen | GLY | 96 | 7.30 | [27] |
North African catfish (Clarias gariepinus) | GLY | 96 | 0.295 | [28] |
Zebrafish (Danio rerio) |
Atnor 48 2 | 96 | 76.50 | [29] |
Ten spotted live-bearer (Cnesterodon decemmaculatus) |
Glyfoglex 3 | 96 | 41.40 | [30] |
1 Roundup (active substance glyphosate, 41%), 2 Atnor 48 (active substance glyphosate, 48%), 3 Glyfoglex (active substance glyphosate, 48%).
Species | Formulation | Exposure (Hours) | Concentration (mg/L) | References |
---|---|---|---|---|
Boana pardalis | GLY | 96 | 106 | [31] |
Physalaemus cuvieri | 96 | 115 | ||
Green frog (Lithobates clamitans) |
Roundup 1 | 24 | 6.6 | [32] |
96 | 6.5 | |||
Northern leopard frog (Lithobates pipiens) |
24 | 11.9 | ||
96 | 9.2 | |||
Wood frog (Lithobates sylvaticus) |
24 | 18.1 | ||
96 | 16.5 | |||
Dwarf American toad (Anaxyrus americanus) |
24 | 13.5 | ||
96 | <12.9 | |||
Rhinella arenarum | Roundup Ultra-Max 2 | 48 | 2.42 | [33] |
77.52 |
1 Roundup (active substance glyphosate, 41%).
Species | Concentration | Exposure | Effects | References |
---|---|---|---|---|
Common carp (Cyprinus carpio) |
2.5, 5, 10 mg/L (GLY) |
96 h | ↑ ALP in liver, heart, GOT in liver and kidney, GPT in kidney;Subepithelial edema and epithelial hyperplasia in gills, focal fibrosis in liver | [23] |
3.5, 7, 14 mg/L (Roundup 1) |
16 days | ↑ MCV, MCH; ↓ AChE in muscle, brain and liver, Hb, HCT, RBC, WBC, AST, ALT, LDH |
[24] | |
52.08, 104.15 mg/L (GLY) |
7 days | Vacuolization of the renal parenchyma and intumescence of the renal tubule in kidney, immunotoxicity | [25] | |
↑ AST, ALT, MDA, PC; ↓ GSH, inhibition of NA+/K+ -ATPase, SOD, CAT, GPx, GR, T-AOC, induce inflammatory response in gills |
[36] | |||
European eel (Anguilla Anguilla) |
58, 116 μg/L (Roundup 1) |
1, 3 days | ↑ TBARS, LPO, GDI, ENA | [19] |
↑ GDI, damaged nucleoids, EndoIII | [35] | |||
Curimbata (Prochilodus lineatus) |
10 mg/L (Roundup 1) |
24 h | ↑ GSH, GST, LPO; ↓ SOD, GPx, inhibition of AChE in muscle |
[14] |
96 h | ↑ GST, LPO;inhibition of AChE in muscle in brain and muscle | |||
Spotted snakehead (Channa punctatus) |
32.54 mg/L (Roundup 1) |
1, 7, 14, 21, 28, 35 days | ↑ TBARS, DNA damage, LPO, ROS; ↓ CAT, SOD, GR in gill and blood |
[38] |
Ten spotted live-bearer (Cnesterodon decemmaculatus) |
1, 1.75, 35 mg/L (GLY) |
96 h | ↓ AChE | [39] |
Megaleporinus obtusidens | 3, 6, 10, 20 mg/L (Roundup 1) |
96 h | ↑ hepatic GL, GLU, NH3 in liver and muscle, PCV, Hb, RBC, WBC, P; ↓ AChE in brain, LACT, P in liver, muscle GL, GLU |
[40] |
5 mg/L (Roundup 1) |
90 days | ↑ LACT in liver and muscle, P in liver; ↓ AChE, GL in liver, P in muscle, PCV, Hb, RBC, WBC |
[41] | |
Rhamdia quelen | 0.2, 0.4 mg/L (Roundup 1) |
96 h | ↑ hepatic GL, LACT in liver and muscle, P in liver and muscle, NH3 in liver and muscle, TBARS in muscle; ↓ muscle GL, GLU in liver and muscle, AChE in brain |
[42] |
0.730 mg/L (GLY) |
24, 96 h, 10 days |
↑ immature circulating cells; ↓ RBC, THR, WBC, phagocytic activity, agglutination activity, lysozyme activity |
[43] | |
Rhamdia quelen | 18, 36, 72 μg/L (Roundup 1) |
7 days | ↑ TP in liver, ↑ GL in muscle; ↓ TP, GL, TL in gills, liver, and kidney |
[44] |
Goldfish (Carassius auratus) |
2.5–20 mg/L (Roundup 1) |
2 months | ↑ CAT in liver and kidney; ↓ GR in kidney, liver, and brain, G6PDH in kidney, liver and brain, SOD in kidney, liver and brain |
[45] |
0.22, 0.44, 0.88 mmol/L (GLY) |
96 h | Behaviour abnormalities (observed depression, erratic swimming, partial loss of equilibrium), liver tissue damage (cellular swelling, inflammatory cell infiltration, hydropic degeneration, loose cytoplasm, ↑ brown particles), kidney tissue damage (edema in the epithelial cells of renal tubules, ↑ cell volume, loose cytoplasm, slight staining), changes in plasma (↑ CK, UN, ↓ LDH) | [46] | |
0.2 mmol/L (Nongteshi 2) |
90 days | Hyaline cast in kidney, ↑ CRE, BUN, ALT, AST, LDH, MDA, ↑ 3-hydroxybutyrate, LACT, alanine, acetamide, glutamate, glycine, histidine, inosine, GLU;↓ SOD, GSH-Px, GR, lysine, NAA, citrate, choline, phosphocholine, myo-inosine, nicotinamide, |
[47] | |
North African catfish (Clarias gariepinus) |
0, 19, 42, 94, 207, 455mg/L (GLY) |
96 h | Cellular infiltration in gills; fatty degeneration, fat vacuolation, diffuse hepatic necrosis, infiltration of leukocytes in liver; hematopoietic necrosis, pyknotic nuclei in kidney; mononuclear infiltration, neuronal degeneration, spongiosis in brain; respiratory stress, erratic swimming | [28] |
Hybrid fish jundiara (Leiarius marmoratus × Psedoplatystoma reticulatum) |
1.357 mg/L (Roundup 1) |
6, 24, 48,96 h | ↑ LACT in liver, P level in liver, ALT, AST, CHOL, TAG in plasma; ↓ GL in liver and muscle, plasma GLU, Hb, PCV, RBC, WBC |
[48] |
Zebrafish (Danio rerio) |
50 μg/mL (GLY) |
24 h | ↓ gene expression in eye, fore, and midbrain delineated brain ventricles and cephalic regions |
[49] |
32.5, 65, 130 μg/L (Transorb 3) |
48 h | ↓ integrity of plasma membrane of hepatocytes, viability of cells, mitochondrial activity in the cell, lysosomal integrity, inhibition in ABC transporter activity | [50] | |
10, 50, 100, 200, 400 μg/L (GLY) |
48 h | ↓ heartbeat, NO generation, downregulation of Cacana1C and ryr2a genes, upregulation of hspb11 | [37] | |
Climbing bass (Anabas testudineus) |
17.20 mg/L (Excel Mera 71 4) |
30 days | ↑ AChE, LPO, CAT; ↓ TP, GST |
[51] |
Heteropneustes fossilis |
Species | Concentration | Exposure | Effects | References |
---|---|---|---|---|
Mediterranean mussel (Mytilus galloprovincialis) |
100 μg/L (GLY) |
7 days | ↑ THC, haemocyte proliferation; ↓ Haemocyte diameter, AChE in gills |
[52] |
14 days | ↑ AChE in gills, CAT in digestive gland; ↓ CAT in gills |
|||
21 days | ↑ CAT in gills; ↓ THC, haemocyte diameter, haemocyte volume, HL, AChE in gills |
|||
10, 100, 1000 μg/L (GLY) |
7, 14, 21 days | ↑ cell volume of haemocyte, haemolymph pH; ↓ HL, haemolymph acid phosphatase activity; AChE in gills; SOD in digestive gland, THC, |
[54] | |
Limnoperna fortunei |
1, 3, 6 mg/L (GLY) |
26 days | ↑ TBARS, GST, ALP; ↓ CES, SOD |
[55] |
10, 20, 40 mg/L (GLY) |
3 weeks | ↓ presence of large mussel by 40%, presence empty shell by 25% | [56] | |
Pacific oyster (Crassostrea gigas) |
0.1, 1, 100 μg/L (Roundup Expres 1) |
35 days | ↑ GST; ↓ growth; LPO, MDA |
[57] |
California blackworm (Lumbriculus variegatus) |
0.05–5 mg/L(GLY) | 4 days | ↑ SOD; ↓ GST, membrane bound GST |
[58] |
Chinese mitten crab (Eriocheir sinensis) |
4.4, 9.8, 44, 98 mg/L(GLY) | 96 h | ↑ % DNA in tail, SOD, POD, β-GD;↓ THC, granulocytes, phagocytic activity, ACP, AKP | [34] |
American bullfrog (Lithobates catesbeianus) |
1 mg/L (Roundup 2) |
48 h | ↑ swimming activity, CPM; SOD, CAT and LPO in liver; LPO in muscle; ↓ SOD, CAT in muscle, TtHR |
[59] |
Rhinella arenarum | 1.85, 3.75, 7.5, 15, 30, 60, 120, 240 mg/L (Roundup Ultra-Max 3) |
48 h | ↓ AChE, BChE, CbE, GST | [33] |
Northern leopard frog (Rana pipiens) |
0.6, 1.8 mg/L (Roundup 2) |
166 days | ↑ TRβ mRNA; Late metamorphic climax, developmental delay, abnormal gonads, necrosis of the tail tip, fin damage, abnormal growth on the tail tip, blistering on the tail fin |
[32] |
Snail(Biomphalaria alexandrina) | 3.15 mg/L (Roundup 2) |
6 weeks | ↑ mortality, stopped egg lying, abnormal laid eggs, ↑ GLU, LACT, FAC; ↓ egg hatchability, GL, TP, pyruvate, nucleic acids levels |
[60] |
10 mg/L (Roundup 2) |
7 days | ↑ in vitro phagocytic activity, DNA damage in haemocytes | [61] |
1 Roundup Expres (active substance glyphosate, 15%), 2 Roundup (active substance glyphosate, 41%), 3 Roundup Ultra-Max (active substance glyphosate, 36%).