Insect herbivores can regulate their food intake by mixing food sources with different nutrient content,but face the resulting challenge of ingesting various plant sec-ondary metabolites.How insects deal with toxins in a complex nutrient environment is unclear.Here we investigated the influence of a classic plant secondary metabolite,allyl glucosinolate (sinigrin),and its hydrolyzed product allyl isothiocyanate (AITC),on the de-velopment ofHelicoverpa armigera (Hübner) (Lepidoptera:Noctuidae) when fed on diets with different protein-to-carbohydrate (p :c) ratios.We also examined the effects of these toxins on larval biochemistry,by chemically analyzing the frass produced by insects feed-ing on the different diets.As expected,AITC had a greater negative effect than sinigrin on H.armigera life-history traits.However,AITC at low concentration appeared to have a positive effect on some traits.Both sinigrin and AITC-induced detoxification activity in the gut,and the reaction was related to diet protein concentration.High-protein diets can provide the required free amino acid,especially cysteine,needed for the detoxification process.The nutrient content of the diet influences how plant secondary metabolites are handled,and the use of artificial diets in experiments investigating the metabolic fate of plant secondary compounds needs to be carefully evaluated.

Peng Wang;Daniel G.Vass(a)o;Bettina Raguschke;Michael J.Furlong;Myron P.Zalucki

School of Biological Sciences,The University of Queensland,St Lucia,Queensland,Australia;Department of Biochemistry,Max Planck Institute for Chemical Ecology,Jena,Germany

中国昆虫科学（英文版）

[1]Peng Wang;Daniel G.Vass(a)o;Bettina Raguschke;Michael J.Furlong;Myron P.Zalucki-.Balancing nutrients in a toxic environment:the challenge of eating)[J].中国昆虫科学（英文版）,2022(01):289-303

ofHelicoverpa,frass

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