PMID: 12770489May 29, 2003Paper

Impact of dietary allelochemicals on gypsy moth (Lymantria dispar) caterpillars: importance of midgut alkalinity

Journal of Insect Physiology
H M AppelH L. Govenor

Abstract

Midgut pH of gypsy moth larvae was depressed artificially with buffered diet to examine the impact of alkalinity on the caterpillars' ability to tolerate a dietary polyphenol and a quinone. A 2x3 factorial design was used, with 2 levels of succinate buffer and 3 dietary amendments (tannic acid, juglone, or control). Development was monitored during the third and fourth instars, with consumption, food passage rates, midgut pH, and midgut redox potential (Eh) measured in the fourth instar. Diet buffering successfully depressed midgut pH to hypothetically suboptimal acidic levels without reductions in survivorship, but it did reduce larval growth and impede development. Buffering dramatically reduced survivorship of fourth instar larvae eating diets containing tannic acid or juglone. Growth increased on unbuffered diet amended with tannic acid, but not with juglone. Caterpillars passed food through the gut more slowly when feeding on buffered tannic acid diet or on unbuffered juglone diet. These results indicate that maintenance of midgut alkalinity is critical to tolerance of dietary tannic acid and juglone, and that these allelochemicals have very different activities in the caterpillar gut.

References

Mar 1, 1994·Journal of Chemical Ecology·G W FeltonS S Duffey
Jul 1, 1993·Journal of Chemical Ecology·H M Appel
Sep 1, 1991·Journal of Chemical Ecology·G W Felton, S S Duffey
Dec 1, 1990·Journal of Chemical Ecology·H M Appel, M M Martin

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Citations

May 10, 2000·Journal of Insect Physiology·K S Johnson, V Barbehenn R
Dec 9, 2000·Annual Review of Entomology·J F Harrison
Mar 14, 2013·Journal of Chemical Ecology·Jennifer Sorensen ForbeyWilliam J Foley
Jan 9, 2004·Applied and Environmental Microbiology·Nichole A BroderickJo Handelsman
Feb 19, 2008·The Journal of Experimental Biology·T D Fitzgerald

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