Variation in the chromosomal distribution of amplified esterase (FE4) genes in Greek field populations of Myzus persicae (Sulzer)

Article Abstract:

Fluorescence in situ hybridization (FISH) has been used to study variation in the distribution and number of loci with amplified esterase genes in clones established from field populations of Myzux Persicae-group aphids from assorted crops in northern Greece. In that area insecticides have been used extensively on M. Persicae aphid populations. Peach is the primary host, and the one on which annual sexual reproduction occurs. The secondary host field crops include tobacco, on which reproduction is totally parthenogenetic. The insecticides have been used on both kinds of hosts. High levels of resistance based on the amplification of two genes encoding insecticide-degrading esterases are the result. Variation exists in the chromosomal distribution of amplified esterase (FE4) genes in Greek field populations of M. persicae (Sulzer).

Greece, Observations, Natural history, In situ hybridization

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Genetics of esterase-mediated insecticide resistance in the aphid Schizaphis graminum

Article Abstract:

The pattern of inheritance and underlying genetic mechanism of organophosphate resistance have been studied in the aphid Schizaphis graminum (green-bug). It appears that gene amplification may be the mechanism behind the R1 esterase activity. However, another genetic mechanism may produce R2 elevated esterase activity.

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Analogous pleiotropic effects of insecticide resistance genotypes in peach-potato aphids and houseflies

Article Abstract:

Research demonstrates that target-site resistance to pyrethroids and DDT in peach-potato aphids and houseflies, and gene amplification associated metabolic resistance, conferred by carboxylesterase, to organophosphates and carbamaes in aphids can cause deleterious pleiotropic effects on fitness.

Influence, Gene mutations, Gene mutation, Housefly

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