Summary
Papilio glaucus subspecies, hybrids and backcrosses exhibit greatly different abilities to use quaking aspen (Populus tremuloides) and other members of the Salicaceae as host plants. This study was conducted to test the hypotheses that phenolic glycosides account for the differences in larval performance, and that differential performance is correlated with differential larval esterase activities. To test the hypotheses we conducted first instar survival trials and fourth (penultimate) instar feeding trials with tremulacin, a phenolic glycoside. We also conducted assays of β-glucosidase, esterase, and glutathione transferase activities, using midgut enzyme preparations from fifth instars. First instar survival on the tremulacin treated diet generally improved with a higher proportion of Papilio glaucus canadensis genes in the genotype, although survival in one backcross treatment was surprisingly low. Penultimate instars of P.g. glaucus and P.g. australis fed tremulacin treated black cherry leaves experienced a severe reduction in growth rate relative to larvae fed control leaves. This seriously suppressed growth was partially due to reduced consumption rates and reduced conversion efficiencies, however, approximate digestibility was not affected. In contrast, P. g. canadensis and hybrids showed no differences in growth rates between tremulacin treated and control leaves. Reciprocal backcrosses of hybrids with P. g. glaucus resulted in slightly suppressed growth on treated versus control leaves. The results suggest that after a certain threshold, increased proportions of P. g. glaucus genes resulted in poorer growth performance with tremulacin in the diet. Soluble esterase activities generally increased with the proportion of Papilio glaucus canadensis genes in the genotype, and paralleled overall trends in larval survival and feeding performance. We conclude that phenolic glycosides such as tremulacin are responsible for differential performance of Papilio glaucus subspecies, hybrids and backcrosses fed plants in the Salicaceae, and that detoxification of phenolic glycosides by midgut esterase explains why some Papilio glaucus genotypes can effectively utilize these plants.
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Scriber, J.M., Lindroth, R.L. & Nitao, J. Differential toxicity of a phenolic glycoside from quaking aspen to Papilio glaucus butterfly subspecies, hybrids and backcrosses. Oecologia 81, 186–191 (1989). https://doi.org/10.1007/BF00379804
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DOI: https://doi.org/10.1007/BF00379804