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Titolo:
Ascorbic and uric acid responses to xanthotoxin ingestion in a generalist and a specialist caterpillar
Autore:
Timmermann, SE; Zangerl, AR; Berenbaum, MR;
Indirizzi:
Univ Illinois, Dept Entomol, Urbana, IL 61801 USA Univ Illinois Urbana ILUSA 61801 ois, Dept Entomol, Urbana, IL 61801 USA
Titolo Testata:
ARCHIVES OF INSECT BIOCHEMISTRY AND PHYSIOLOGY
fascicolo: 1, volume: 42, anno: 1999,
pagine: 26 - 36
SICI:
0739-4462(199909)42:1<26:AAUART>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
WILD PARSNIP; ANTIOXIDANT ENZYMES; TRICHOPLUSIA-NI; DEFENSE; INSECT; FURANOCOUMARINS; LEPIDOPTERA; DROSOPHILA; WEBWORM; STRESS;
Keywords:
ascorbic acid; antioxidant; furanocoumarins; generalist; specialist; uric acid;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Berenbaum, MR Univ Illinois, Dept Entomol, 320 Morrill Hall,505 S Goodwin,Urbana, IL 61801 USA Univ Illinois 320 Morrill Hall,505 S Goodwin Urbana IL USA 61801
Citazione:
S.E. Timmermann et al., "Ascorbic and uric acid responses to xanthotoxin ingestion in a generalist and a specialist caterpillar", ARCH INS B, 42(1), 1999, pp. 26-36

Abstract

For herbivorous insects, dietary sources of low molecular weight non-enzymatic antioxidant, such as ascorbic acid, may influence performance in the presence of phototoxic plant constituents. We examined responses of Trichoplusia ni, a broad generalist, and Depressaria pastinacella, a specialist on furanocoumarin-containing plants, to variation in dietary ascorbic acid availability in the presence and absence of xanthotoxin, a phototoxic furanocoumarin, In T. ni, dietary ascorbic acid significantly increased levels of this compound in body tissues (approximately 7-fold, 5-fold, and 8-fold in hemolymph, gut, and fat body, respectively), In the presence of xanthotoxin,however, the amount of ascorbic acid accumulated significantly decreased. This decrease was not due to antifeedant effects of xanthotoxin and may instead have resulted from depletion of ascorbic acid due to its radical scavenging activity. In contrast, ascorbic acid levels in D, pastinacella were less affected by variation in dietary levels of either xanthotoxin or ascorbic acid, although uric acid, another potential water-soluble nonenzymatic antioxidant, increased in response to dietary ascorbic acid, as it did in T.ni. Thus, for generalists, such as T. ni, that lack specialized detoxification mechanisms against phototoxins such as furanocoumarins, dietary ascorbic acid may play an important role in antioxidant defense, and, for caterpillars in general, uric acid may also contribute to antioxidant defenses. (C) 1999 Wiley-Liss, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 12:37:45