Effect of glyphosate-based herbicides on the photosynthetic responses of the macrophyte Egeria densa Planch. from topical lotic ecosystems

IF 1.2 4区 环境科学与生态学 Q4 LIMNOLOGY Limnetica Pub Date : 2022-01-15 DOI:10.23818/limn.41.06
Guilherme Diagonel, Orlando Aparecido Carriel, R. Oliveira, L. K. Vilas Boas, Ciro Cesar Zanini Branco
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引用次数: 1

Abstract

Effect of glyphosate-based herbicides on the photosynthetic responses of the macrophyte Egeria densa Planch. from topical lotic ecosystems The effects of pesticide pollution on eco-physiological responses in primary producers are understudied. To partly overcome this gap, this study evaluated the effects of a glyphosate-based herbicide, Roundup® (three nominal concentrations: 0.28 mg/L [Treatment T0.28]; 3.5 mg/L [T3.5]; and 6 mg/L [T6]), and its main degradation product, aminomethylphosphonic acid (AMPA) (0.03 mg/L [T0.03]), on the photosynthetic responses of an aquatic macrophyte species, Egeria densa Planch. The net photosynthetic rate (NPR) and dark respiration rate (DRR) were evaluated by the dissolved oxygen evolution method, while some PSII performance parameters were measured by a Chl-a fluorescence-based method. Additionally, the chlorophyll a content was measured. The experimental data showed that E. densa had significant losses in photosynthetic efficiency under Roundup® and AMPA exposure, with reductions in the NPR (reduction of -61 % for T3.5; –90 % for T6; and –161 % for T0.03, compared to control) and chlorophyll a content (–82 % for T0.28, –79 % for T3.5, –82 % for T6, and –28 % for T0.03) and increases in the DRR (+150 % for T3.5, +130 % for T6, and +271 % for T0.03). The results from the Chla fluorescence measurements registered statistically significant differences between the Roundup® treatments and the control group for the effective quantum yield (+56 % for T0.28, +43 % for T3.5, and +56 % for T6) and for non-photochemical extinction (+67% for T0.28, +73 % for T3.5, and +59 % for T6). Taken together, the findings of the experiments with E. densa indicate that the negative effects from the glyphosate-based herbicide Roundup® on primary producers might be common and widespread in tropical and subtropical aquatic environments in Brazil.
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草甘膦类除草剂对阔叶草光合反应的影响。从局部生态系统
草甘膦类除草剂对大型植物密叶Egeria densa Planch光合反应的影响。来自局部乳液生态系统农药污染对初级生产者生态生理反应的影响研究不足。为了部分克服这一差距,本研究评估了草甘膦除草剂农达®(三种标称浓度:0.28 mg/L【处理T0.28】、3.5 mg/L【T3.5】和6 mg/L【T6】)及其主要降解产物氨基甲基膦酸(AMPA)(0.03 mg/L【T0.03】)对水生大型植物Egeria densa Planch的光合反应的影响。净光合速率(NPR)和暗呼吸速率(DRR)通过溶解氧释放法进行评估,而PSII的一些性能参数则通过Chl-a荧光法进行测量。此外,还测定了叶绿素a的含量。实验数据表明,在Roundup®和AMPA暴露下,E.densa的光合效率显著下降,NPR降低(与对照相比,T3.5降低了-61%;T6降低了-90%;T0.03降低了-161%),叶绿素a含量降低(T0.28降低了82%,T3.5减少了-79%,T6减少了-82%,T0.03增加了-28%),DRR增加(T3.5增加了150%,T6增加了130%,T00.03增加了+271%)。叶绿素a荧光测量的结果具有统计学意义Roundup®处理与对照组在有效量子产率(T0.28为+56%,T3.5为+43%,T6为+56%)和非光化学消光(T0.28+67%,T3.5+73%,T6+59%)方面的差异。总之,E.densa的实验结果表明,草甘膦除草剂农达®对初级生产者的负面影响可能在巴西的热带和亚热带水生环境中普遍存在。
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来源期刊
Limnetica
Limnetica LIMNOLOGY-MARINE & FRESHWATER BIOLOGY
CiteScore
3.70
自引率
7.10%
发文量
26
审稿时长
>12 weeks
期刊介绍: Limnetica publishes original research articles on the ecology of inland waters. The scope of Limnetica includes the ecology of rivers, lakes, reservoirs, coastal lagoons and wetlands, as well as biogeochemistry, paleolimnology, development of new methodologies, taxonomy, biogeography and any aspect of theoretical and applied continental aquatic ecology such as management and conservation, impact assessment, ecotoxicology and pollution. Limnetica will accept for its publication scientific articles presenting advances in knowledge or technological development, as well as as papers derived from new practical approaches on the topics covered by the journal.
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