In this paper we analysed the basis of insecticide resistance in 59 Italian strains of the peach potato aphid Myzus persicae using both molecular and biochemical assays. Our data as a whole clearly indicate that most M. persicae strains (76.3%) have high or extremely high production of an esterase enzyme which sequester and detoxify insecticides with esteric group. Kdr genotypes conferring resistance towards pyrethoids are present in 57.7% of the analysed populations. Moreover, 26.5% of the kdr positive strains possess also the M918T mutation conferring super-kdr phenotype. Strains with modified AChE (MACE) are not so numerous (27.1%), although they can be found almost everywhere in Italy. Considering all the strains analysed, both MACE and kdr phenotypes are associated with high levels of esterase activity. In Central-Southern regions, kdr and MACE resistance mechanisms resulted in linkage disequilibrium. Bioassays performed in order to evaluate the efficacy of a pyrethroid insecticide against a strain possessing a F979S mutation within its paratype sodium channel gene suggests that this amino acid substitution could affect the sodium channel responsivity to pyrethroids.
|Anno di pubblicazione:||2008|
|Titolo:||Biochemical and molecular diagnosis of insecticide resistance conferred by esterase, MACE, kdr and super-kdr based mechanisms in Italian strains of the peach potato aphid, Myzus persicae (Sulzer)|
|Autore/i:||CRINITI A; MAZZONI E; CASSANELLI S; CRAVEDI P; TONDELLI A; BIZZARO D; G. MANICARDI|
|Codice identificativo ISI:||WOS:000253695200003|
|Codice identificativo Scopus:||2-s2.0-39049113812|
|Citazione:||Biochemical and molecular diagnosis of insecticide resistance conferred by esterase, MACE, kdr and super-kdr based mechanisms in Italian strains of the peach potato aphid, Myzus persicae (Sulzer) / CRINITI A; MAZZONI E; CASSANELLI S; CRAVEDI P; TONDELLI A; BIZZARO D; G. MANICARDI. - In: PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY. - ISSN 0048-3575. - STAMPA. - 90(2008), pp. 168-174.|
|Tipologia||Articolo su rivista|
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