Effect of Host Plants and Dietary and Dietary Quercetin on Antioxidant Enzymes in Onion and Seedcorn Maggots, Delia antiqua and D.platura(Diptera:Anthomyiidae)

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Effect of host plants and dietary quercetin on antioxidant enzymes, superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPOX), was studied in the onion and seedcorn maggots, Delia antiqua and D. platura. SOD activity of the latter species was 1.7 times that of the former when the two species were grown on a synthetic diet devoid of plant secondary compounds. SOD activities of the two species feeding on respective host plants were 100-230% greater than those of larvae feeding on the synthetic diet. Synthetic diet containing up to 0.1% of quercetin, a prooxidant chemical present in onion bulbs, elicited no increase in SOD activity, though SOD grew ca. 2.5 times in both species when the concentration was raised to 1.0%. CAT levels were very high, being unaffected by the diet or the addition of quercetin in both species. Strong inhibition of GPOX was observed in onion maggots reared on onion and the synthetic diet containing 0.1% quercetin.

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