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In this study, we tested the effects of dietary nickel on the activity of glutathione S-transferase (GST), esterases, phenoloxidase, and encapsulation in the haemolymph of larvae of the greater wax moth Galleria mellonella. We also explored the effects of dietary nickel on larval resistance to infection by the fungus Beauveria bassiana. Larvae fed a low dose of nickel (10 μg g−1) had significantly higher GST, phenoloxidase activity and encapsulation responses than controls fed on a nickel-free diet. We also found that larvae fed a sublethal dose of nickel (50 μg g−1) had increased GST, esterase activity and encapsulation rates but decreased phenoloxidase activity. Although, a sublethal dose of dietary nickel enhanced innate immunity, we found that this reduced resistance against the real pathogen. Our results suggest that enhanced immunity and detoxification enzyme activity of insects may not be beneficial to resistance to fungal infection. It appears that there is a trade off between different resistance mechanisms in insects under different metal treatments. 相似文献
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Life history traits of gypsy moth larvae markedly decrease under the effect of host plant insect resistance, but no significant changes occur in immunity parameters such as hemolymph phagocytic activity and lysozyme-like activity of hemolymph plasma and midgut tissue; moreover, alkaline protease activity in the midgut contents becomes higher. The actual sensitivity of the larvae to Bacillus thuringiensis remains unchanged. 相似文献
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V. V. Martemyanov S. A. Bakhvalov M. J. Rantala I. M. Dubovskiy E. E. Shul’ts I. A. Belousova A. G. Strel’nikov V. V. Glupov 《Russian Journal of Ecology》2009,40(6):434-439
The effects of birch resistance induced by its artificial defoliation on the development of gypsy moth larvae and their sensitivity
to viral infection and on the state of the antioxidant and detoxification systems of the insect midgut were studied. The dynamics
of larval body weight; larval mortality and its etiology; glutathione-S-transferase (GT), nonspecific esterase (NE), and catalase
(CAT) activities; and the ratio between the concentrations of oxidized and reduced thiol-containing compounds (RSSR/RSH) were
estimated. In larvae feeding on the leaves of a previously defoliated plant, body weight was decreased, NE was inhibited,
and the RSSR/RSH ratio was increased. 相似文献
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