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Specifity of Induced Resistance to Hypoxia and Hypercarbia in Two Strains of Tribolium Castaneum (Herbst)


Department of Stored Products, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel

Abstract: Two strains of Tribolium castaneum, one selected for resistance to a low oxygen content atmosphere (LOC) and the other. fop resistance to a high carbon dioxide content atmosphere (HCC), were used t o ~thte s pecificity of their laboratory-indud resistance, The LOC-selected strain was shown to be susceptible when exposed to HCC, while the HCC-selected strain was found to be susceptible to LOC. This indicates that survival udder hypoxia and hypercarbia requires different adaptive mechanisms. Exposure of the LOCselected strain to anoxia revealed greater tolerance than an unselected strain. Exposure of both strains to a 60:8:32 mixture of CO₂, O₂, and N₂ showed both strains to be more resistant than an unselected strain. Exposure of the selected strains to methyl bromide and phospliine failed to reveal any crossresistance imparted to the insects against the fumigants.

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