To overcome host plant defense mechanisms, herbivorous insects have developed a series of strategies, which include changes in reliance on various classes of detoxification enzymes. There are few relevant experimental studies on detoxification enzymes of whitefly biotypes B and Q when shifting to different host plants. Here we report changes in the activities of carboxylesterase (CarE), cytochrome-P450-dependent monooxygenase (P450), and glutathione S-transferase (GST) of B. tabaci biotypes B and Q, 24 h after these biotypes had been transferred from cucumber (Cucumis sativus L.; Cucurbitaceae) to numerous other host species belong to 29 families. The aim of this study was to compare the differential utilization of the above detoxifying enzymes by these 2 B. tabaci biotypes when the latter were subjected to shifts between host species. The GST activities of these 2 biotypes did not change significantly 24 h after being shifted from cucumber to various other hosts. However after such recent shifts from cucumber to various other host species, most values of CarE and P450 of biotype Q were significantly higher than those of biotype B at P < 0.05. The experiments revealed that B. tabaci biotypes utilize different defense strategies of differentially inducing detoxification enzymes when facing a variety of host shifts.
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Vol. 97 • No. 2