Biochemical determination of acetylcholinesterase genotypes conferring resistance to the organophosphate insecticide chlorpyriphos in field populations of Bemisia tabaci from Benin, West Africa

Houndete Th., Fournier Didier, Ketoh Guillaume Koffivi, Glitho Isabelle Adolé, Nauen R., Martin Thibaud. 2010. Biochemical determination of acetylcholinesterase genotypes conferring resistance to the organophosphate insecticide chlorpyriphos in field populations of Bemisia tabaci from Benin, West Africa. Pesticide Biochemistry and Physiology, 98 (1) : 115-120.

https://doi.org/10.1016/j.pestbp.2010.05.009

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Quartile : Q2, Sujet : ENTOMOLOGY / Quartile : Q4, Sujet : PHYSIOLOGY / Quartile : Q4, Sujet : BIOCHEMISTRY & MOLECULAR BIOLOGY

Résumé : Resistance to chlorpyriphos insecticide in Bemisia tabaci from a field population collected in Benin, West Africa was suggested with bioassay showing the presence of two sub-populations. Patterns of acetylcholinesterase (AChE) inhibition by the organophosphate chlorpyriphos-oxon were analyzed to estimate the number of possible genotypes with different sensitivity expected in three B. tabaci field populations collected in Benin. The analysis of inhibition patterns in these populations compared with four laboratory strains of B. tabaci using chlorpyriphos-oxon allowed the differentiation of three possible genotypes. In the reference strain SUD-S we detected two different acetylcholinesterases with different sensitivity to chlorpyriphos oxon suggesting the presence of two genes ace 1 and ace 2. The proportion of the insensitive enzyme (ace 2) was estimated to be 31%. In field populations we can detect two alleles at the same gene locus ace 1: one susceptible ace1S and one resistant ace1R. Both strains called Arizona University and Mexico-S2 have lost sensitive ace1S but the field populations from Benin clearly contained at least three genotypes confirming heterogeneous populations not completely resistant.

Mots-clés Agrovoc : Bemisia tabaci, résistance aux insecticides, génotype, acétylcholine, estérase, chlorpyrifos, composé organophosphoré, génétique des populations, expérimentation au champ, expérimentation en laboratoire

Mots-clés géographiques Agrovoc : Bénin

Classification Agris : H10 - Ravageurs des plantes

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

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