Acute toxic effect of glyphosate on Pomacea canaliculata under the condition of oxidative deposition
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摘要:目的
探究草甘膦与H2O2复合污染条件下草甘膦对福寿螺Pomacea canaliculata的急性毒性效应。
方法采用静水式生物测试法,采集田间生长均匀一致的成年福寿螺,使其暴露于不同浓度草甘膦和近似广州地区降水H2O2浓度(50 μmol·L−1)的水体中。研究氧化沉降条件下草甘膦对福寿螺生境的水质部分指标和急性毒性效应的影响。
结果水体水质指标中,氧化还原电位(Oxidation-reduction potential,ORP)随暴露时间增加而上升,由330 mV上升至540 mV左右;pH随暴露时间增加,不同处理有上升也有下降的趋势,最终都维持在7.0~8.5;溶解氧(Dissolved oxygen,DO)在8.5~16.0 mg·L−1之间,无固定变化规律;这3个指标都维持在福寿螺生长能适应的范围内。急性毒性试验表明,草甘膦对福寿螺为低毒,在有或无H2O2添加时其48 h的半致死浓度(LC50)均为133.479 mg·L−1。在高浓度草甘膦作用下,福寿螺抗氧化胁迫酶[超氧化物歧化酶(SOD)和过氧化氢酶(CAT)]以及能量代谢相关酶[淀粉酶(AMS)和脂肪酶(LPS)]活性呈先诱导上调、后被抑制、而后又适应上调的趋势,说明在染毒过程中福寿螺能慢慢适应所处胁迫环境并不断提高抗逆性,在逆境中正常生存。
结论氧化沉降条件下,草甘膦对福寿螺急性毒性效应为低毒,4种典型酶的酶活性总体呈上调升高的趋势,试图通过草甘膦除草的同时又抑制福寿螺是无效和不现实的。
Abstract:ObjectiveTo explore the acute toxic effect of glyphosate on Pomacea canaliculata under the combined pollution of glyphosate and H2O2.
MethodUsing the hydrostatic biological test method, adult Pomacea canaliculata with uniform growth in the field were collected, and exposed to water with different concentrations of glyphosate and similar to the average concentration of H2O2 (50 μmol·L−1) in precipitation of Guangzhou. The influences of glyphosate on some water quality indexes of P. canaliculata habitat and acute toxic effects of P. canaliculata under oxidative deposition conditions were studied.
ResultFor the water quality index, oxidation-reduction potential (ORP) increased with the increase of exposure time, from 330 mV to about 540 mV; The change of pH with the increase of exposure time increased or decreased under different treatments, and finally maintained between 7.0 and 8.5; The concentration of dissolved oxygen (DO) was between 8.5 and 16.0 mg·L−1, and there was no obvious variation trend. The three water quality indexes above were within the range that the growth of P. canaliculata could adapt to. Acute toxicity tests indicated that glyphosate had low toxicity to P. canaliculata, and the 50% lethal concentration (LC50) in 48 h was 133.479 mg·L−1 with or without H2O2 deposition. The anti-oxidative stress enzymes of superoxide dismutase (SOD) and catalase (CAT), as well as energy metabolism-related enzymes of amylase (AMS) and lipase (LPS) in P. canaliculata were firstly up-regulated, then suppressed, and finally adapted to up-regulation. It showed that in the process of poisoning, P. canaliculata could slowly adapt to the stress environment and continuously improve its stress resistance, so that it could survive normally in this stress.
ConclusionUnder the condition of oxidative deposition, the acute toxic effect of glyphosate on P. canaliculata is low, and the activities of the four related typical enzymes are generally up-regulated. It is ineffective and unrealistic to try to inhibit P. canaliculata through herbicide weeding at the same time.
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Keywords:
- Glyphosate /
- Pomacea canaliculata /
- Hydrogen peroxide /
- Acute toxicity /
- Enzymatic activity
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表 1 不同处理下福寿螺水体氧化还原电位(ORP)的变化1)
Table 1 Change of oxidation-reduction potential (ORP) for Pomacea canaliculata water habitat under different treatments
ρ(草甘膦)/(mg·L−1)
Glyphosate concentrationc(H2O2)/(μmol·L−1) ORP/mV 24 h 48 h 72 h 96 h 0(CK) 0 342.66±2.50bc 379.53±4.49b 397.10±1.11ef 464.90±5.02cd 20 0 358.63±0.86bc 389.80±1.19b 409.06±4.74def 471.90±6.91bcd 40 0 352.00±11.65bc 380.16±7.96b 390.40±9.08f 462.70±11.63cd 80 0 357.93±1.40bc 389.76±3.75b 406.00±4.30def 464.16±3.73cd 100 0 330.23±4.91c 372.53±3.67b 410.03±4.60df 452.00±3.06c 20 50 383.43±11.64ab 415.06±17.82ab 455.36±20.72bc 486.90±12.03bc 40 50 366.70±2.10bc 393.66±3.39b 393.66±3.39b 479.76±4.52bcd 80 50 351.50±5.40bc 375.90±4.34b 434.40±16.26cd 487.50±6.81bc 100 50 365.10±1.35bc 395.26±3.96b 470.26±10.82b 497.10±1.94b 0 50 424.70±43.78a 453.63±37.78a 512.93±13.59a 540.16±19.38a 1)表中数据为平均值±标准误,n=3;同列数据后的不同小写字母表示处理间差异显著(P<0.05,Duncan’s法)
1) Data are means ± standard deviations, n=3; Different lowercase letters in the same column indicate significant differences among different treatments (P < 0.05, Duncan’s method)表 2 不同处理下福寿螺水体溶解氧(DO)含量的变化1)
Table 2 Change of dissolved oxygen (DO) content for Pomacea canaliculata water habitat under different treatments
ρ(草甘膦)/(mg·L−1)
Glyphosate concentrationc(H2O2)/(μmol·L−1) ρ(DO)/(mg·L−1) 24 h 48 h 72 h 96 h 0(CK) 0 15.75±0.77a 15.11±0.59a 14.46±1.21a 11.45±1.15ab 20 0 9.08±0.35bc 9.35±0.30de 9.85±0.31cde 10.74±0.44ab 40 0 6.15±0.49c 7.08±0.08e 7.37±0.07e 8.03±0.33b 80 0 8.91±1.57bc 9.54±1.21cde 10.45±0.34bcd 11.94±1.05ab 100 0 15.80±1.88a 14.58±1.05a 12.97±0.87ab 11.88±1.86ab 20 50 12.25±1.66ab 12.55±1.43abcd 12.69±1.42abc 13.11±1.59a 40 50 12.70±1.95ab 12.77±1.88abc 13.10±1.42ab 13.53±0.81a 80 50 13.71±1.70ab 13.41±1.22ab 11.52±1.05abcd 10.32±2.45ab 100 50 9.50±0.37bc 9.31±0.29de 8.91±0.14de 8.50±0.10b 0 50 12.81±2.38ab 10.84±0.84bcd 10.71±0.65bcd 10.34±0.96ab 1)表中数据为平均值±标准误,n=3;同列数据后的不同小写字母表示处理间差异显著(P<0.05,Duncan’s法)
1) Data are means ± standard deviations, n=3; Different lowercase letters in the same column indicate significant differences among different treatments (P < 0.05, Duncan’s method)表 3 不同处理下福寿螺水体pH的变化1)
Table 3 Change of pH for Pomacea canaliculata water habitat under different treatments
ρ(草甘膦)/(mg·L−1)
Glyphosate concentrationc(H2O2)/(μmol·L−1) pH 24 h 48 h 72 h 96 h 0(CK) 0 7.49±0.03b 7.86±0.09b 8.29±0.10a 7.23±0.09a 20 0 5.81±0.12d 6.13±0.06e 7.32±0.19cd 8.04±0.43a 40 0 5.70±0.19d 6.25±0.09e 6.78±0.08d 7.66±0.88a 80 0 5.61±0.15d 6.95±0.03cd 7.22±0.06cd 7.90±0.66a 100 0 6.05±0.63cd 6.65±0.35de 7.15±0.17cd 8.38±0.19a 20 50 6.05±0.63cd 7.28±0.38bcd 7.64±0.24abc 7.94±0.57a 40 50 7.24±0.00b 7.49±0.06bc 7.62±0.17abc 7.88±0.39a 80 50 6.78±0.17bc 7.08±0.06cd 7.54±0.26bc 8.01±0.50a 100 50 5.36±0.04d 6.30±0.25e 7.54±0.17bc 8.14±0.32a 0 50 9.30±0.08a 8.88±0.22a 8.13±0.39ab 7.53±0.59a 1)表中数据为平均值±标准误,n=3;同列数据后的不同小写字母表示处理间差异显著(P<0.05,Duncan’s法)
1) Data are means ± standard deviations, n=3; Different lowercase letters in the same column indicate significant differences among different treatments (P < 0.05, Duncan’s method)表 4 草甘膦对福寿螺的半致死浓度(LC50)
Table 4 The 50% lethal concentration (LC50) of glyphosate to Pomacea canaliculata
mg·L−1 t/h 草甘膦+H2O2
Glyphosate+H2O2草甘膦
Glyphosate24 460.568 145.723 48 133.479 133.479 72 88.614 56.803 96 50.540 36.043 表 5 不同处理对福寿螺各种酶活性的影响1)
Table 5 Effects of different treatments on activities of various enzymes for Pomacea canaliculata
ρ(草甘膦)/(mg·L−1)
Glyphosate concentrationc(H2O2)/
(μmol·L−1)SOD活性/(U·mg−1)
SOD activityAMS活性/(U·mg−1)
AMS activityCAT活性/(U·mg−1)
CAT activityLPS活性/(U·g−1)
LPS activity0(CK) 0 8.73±0.83a 0.02±0.01a 4.63±0.44b 27.90±2.29a 20 0 9.04±1.32a 0.07±0.04a 3.00±0.60b 57.65±14.64a 40 0 11.89±2.39a 0.05±0.01a 3.64±1.30b 55.12±12.31a 80 0 11.29±0.89a 0.02±0.01a 2.05±0.74b 55.34±19.01a 100 0 10.70±1.75a 0.03±0.00a 2.89±1.00b 35.53±11.34a 20 50 11.67±0.73a 0.04±0.02a 5.99±0.55ab 36.42±15.28a 40 50 13.10±3.03a 0.09±0.03a 5.20±1.87ab 34.12±10.39a 80 50 9.36±1.68a 0.12±0.05a 2.15±0.29b 30.57±13.33a 100 50 14.24±2.39a 0.16±0.05a 8.85±2.97a 32.26±14.90a 0 50 13.88±2.36a 0.17±0.13a 2.55±0.76b 60.04±17.07a 1)表中数据为平均值±标准误,n=3;同列数据后的不同小写字母表示处理间差异显著(P<0.05,Duncan’s法)
1) Data are means ± standard deviations, n=3; Different lowercase letters in the same column indicate significant differences among different treatments (P < 0.05, Duncan’s method) -
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