Abstract
Detoxification capacity was examined in a prey/predator system consisting of a predatory stink bug ( Podisus maculiventris (Say)) and its lepidopterous prey, velvetbean caterpillar ( Anticarsia gemmatalis (Hubner)), tobacco budworm ( Heliothis virescens (Fabricius)), fall armyworm ( Spodoptera frugiperda (J. E. Smith)), and corn earworm ( Heliothis zea (Boddie)). Important detoxication enzymes such as microsomal cytochrome P-450-dependent monooxygenases, glutathione transferases, and hydrolases all were active in these insects, the activities being generally lower in the stink bug than in the prey. However, the stink bug had higher levels of cytochrome P-450, microsomal desulfurase, and glutathione transferase (CDNB) activities as compared with those of the prey. In addition, the stink bug contained relatively more high-spin form of cytochrome P-450. There was no correlation between the degree of herbivore polyphagy and detoxifying enzyme activities among the prey, but an apparent connection was observed when allelochemical-oxidizing capacity was considered. The degree of polyphagy was also positively correlated with the level of high-spin P-450 in these insects.
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