An insensitive acetylcholinesterase in Culex pipiens (Diptera: Culicidae) from Portugal

Resistance mechanisms of a strain (PRAMS) of northern house mosquito, Culex pipiens L., collected in Portugal in 1993, and highly resistant to organophosphates and carbamates, were investigated by comparing the resistance characteristics to 3 organophosphorous (temephos, chlorpyrifos, malathion) and...

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Bibliographic Details
Published in:Journal of economic entomology 1996-10, Vol.89 (5), p.1060-1066
Main Authors: Bourguet, D. (Universite Montpellier, Montpellier, France.), Capela, R, Raymond, M
Format: Article
Language:English
Subjects:
ACETILCOLINESTERASA
ACETYLCHOLINESTERASE
Acetylcholinesterase - metabolism
ACTIVIDAD ENZIMATICA
ACTIVITE ENZYMATIQUE
Animals
Biological and medical sciences
BUTOXIDO DE PIPERONIL
BUTOXYDE DE PIPERONYLE
CHLORPYRIFOS
CITOCROMO P 450
CITOCROMOS
CLORPIRIFOS
Culex - enzymology
CULEX PIPIENS
Culicidae
CYTOCHROME
CYTOCHROME P 450
DEFOLIANT
DEFOLIANTES
DETOXIFICACION METABOLICA
DETOXIFICATION METABOLIQUE
Economics and Finance
Freshwater
Fundamental and applied biological sciences. Psychology
Humanities and Social Sciences
INSECTICIDAS
INSECTICIDE
Insecticide Resistance
MALATHION
MALATION
Medically important nuisances and vectors, pests of stored products and materials: population survey and control
MORTALIDAD
MORTALITE
NADH, NADPH Oxidoreductases - metabolism
NADPH-Ferrihemoprotein Reductase
Nuisances
Organothiophosphates
OXIDORREDUCTASAS
OXYDOREDUCTASE
Piperonyl Butoxide
PORTUGAL
PROPOSUR
PROPOXUR
RESISTANCE AUX PRODUITS CHIMIQUES
RESISTENCIA A PRODUCTOS QUIMICOS
SELECCION
SELECTION
TEMEFOS
TEMEPHOS
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Description
Summary:Resistance mechanisms of a strain (PRAMS) of northern house mosquito, Culex pipiens L., collected in Portugal in 1993, and highly resistant to organophosphates and carbamates, were investigated by comparing the resistance characteristics to 3 organophosphorous (temephos, chlorpyrifos, malathion) and 1 carbamate (propoxur) insecticides in the presence or absence of synergists; and by determining the possible occurrence of overproduced esterases or insensitive acetylcholinesterase (AChE). The reference strain MSE from southern France, with an insensitive AchE, was included in all analyses for comparison. For organophosphorous insecticides, resistance in PRAIAS was caused by an insensitive AChE and an increase in oxidative metabolism, although the 2nd mechanism has only a marginal effect. For propoxur, the insensitive AChE was the only resistance mechanism detected. Biochemical properties of both the French and Portuguese insensitive AChEs were similar. We cannot exclude the possibility that PRAIAS and MSE strains possess exactly the same insensitive AChE allele
ISSN:0022-0493
1938-291X
DOI:10.1093/jee/89.5.1060