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Comparative Detoxification of Plant (Magnolia virginiana) Allelochemicals by Generalist and Specialist Saturniid Silkmoths

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Abstract

The foliage of sweetbay magnolia (Magnolia virginana) contains at least two biologically active phenylpropanoid compounds (magnolol and a biphenyl ether) that are toxic to a number of generalist insect herbivores. These compounds have little effect on caterpillars of the sweetbay silkmoth, C. securifera, which is a specialist on sweetbay, but they are toxic to two closely related silkmoths, C. angulifera and C. promethea. To understand the influence of phytochemistry on the evolution of host use and feeding specialization in Callosamia, the detoxification capability of C. securifera was compared with that of C. angulifera and C. promethea. Degradation of magnolol and the biphenyl ether by midgut homogenate of the sweetbay specialist was NADPH-dependent and inhibited by piperonyl butoxide, suggesting the involvement of cytochrome P-450 detoxification enzymes. Both were degraded three times faster in the specialist compared to the unadapted herbivores. Higher rates of degradation could not be induced in the polyphagous C. promethea by a mixture of magnolol and the biphenyl ether or by the P-450 inducer pentamethylbenzene, nor did activity vary significantly when larvae were reared on different host plants. Use of sweetbay by Callosamia silkmoths appears to be dependent on their ability to degrade host toxins rapidly via midgut detoxification enzymes. Moreover, the intraspecific comparisons contradict the common prediction that higher levels of cytochrome P-450 activity are found in more polyphagous species; instead, P-450 activity is more closely associated with specific chemical attributes of the herbivores' host plants.

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  1. K. S. Johnson

    Present address: Department of Biological Sciences, Ohio University, Athens, Ohio, 45701-2979

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  1. Department of Entomology, Michigan State University, East Lansing, Michigan, 48824-1115

    K. S. Johnson

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Johnson, K.S. Comparative Detoxification of Plant (Magnolia virginiana) Allelochemicals by Generalist and Specialist Saturniid Silkmoths. J Chem Ecol 25, 253–269 (1999). https://doi.org/10.1023/A:1020890628279

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