| Enhanced esterase activity and resistance to azinphosmethyl in target and nontarget organisms. | |
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MedLine Citation:
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PMID: 18386945 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The organophosphorous compound azinphosmethyl (AzMe) is applied extensively in northern Patagonia (southern Argentina) to manage codling moths (Cydia pomonella). This area is irrigated by fast-flowing channels that provide a favorable habitat for many species, including amphipods (Hyalella curvispina) and a field-mixed population of black flies (Simulium bonaerense, Simulium wolffhuegeli, and Simulium nigristrigatum). In the present study, AzMe susceptibility and carboxylesterase (CarbE) activity from both insecticide-exposed and nonexposed field populations were studied. The median lethal dose determined in codling moths from an insecticide-treated orchard was significantly higher (3.48 microg/insect) than that observed in those from an untreated orchard (0.69 microg/insect). Similarly, the median lethal concentration (LC50) determined in black flies collected from the treated area (0.021 mg/L) was significantly higher than that recorded in those from the untreated site (0.011 mg/L). For amphipods, both a subpopulation susceptible to AzMe (LC50, 1.83 microg/L) and a resistant one (LC50, 390 microg/L) were found in the treated area. Both subpopulations were more resistant to AzMe than the population from the untreated site (LC50, 0.43 microg/L). Significant differences (p < 0.001) in CarbE activities were observed between populations from pesticide-treated and untreated areas. Mean activities +/- standard deviation from treated and untreated sites were 0.21 +/- 0.16 and 0.016 +/- 0.008 micromol/min/mg protein, respectively, for codling moths; 2.17 +/- 1.71 and 0.81 +/- 0.35 micromol/min/mg protein, respectively, for black flies; and 0.27 +/- 0.10 and 0.14 +/- 0.07 micromol/min/mg protein, respectively, for amphipods. The results suggest that enhanced CarbE activity is one of the mechanisms that provide AzMe resistance in H. curvispina, Simulium spp., and C. pomonella populations from the insecticide-treated areas. |
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Authors:
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Olga L Anguiano; Ana Ferrari; Ii Jimena Soleño; María C Martínez; Andrés Venturino; Ana M Pechen de D'Angelo; Cristina M Montagna |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Environmental toxicology and chemistry / SETAC Volume: 27 ISSN: 0730-7268 ISO Abbreviation: Environ. Toxicol. Chem. Publication Date: 2008 Oct |
Date Detail:
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Created Date: 2008-12-24 Completed Date: 2009-02-02 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8308958 Medline TA: Environ Toxicol Chem Country: United States |
Other Details:
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Languages: eng Pagination: 2117-23 Citation Subset: IM |
Affiliation:
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Facultad de Ingeniería, Universidad Nacional del Comahue, Buenos Aires 1400, Neuquén 8300, Argentina. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Amphipoda Animals Azinphosmethyl / toxicity* Carboxylic Ester Hydrolases / metabolism Cholinesterase Inhibitors / toxicity* Diptera Drug Resistance Esterases / metabolism* Insecticides / toxicity* Invertebrates / physiology* Larva Lethal Dose 50 Moths |
| Chemical | |
Reg. No./Substance:
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0/Cholinesterase Inhibitors; 0/Insecticides; 86-50-0/Azinphosmethyl; EC 3.1.-/Esterases; EC 3.1.1.-/Carboxylic Ester Hydrolases |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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