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Overproduction of Digestive Enzymes Compensates for Inhibitory Effects of Protease and α-Amylase Inhibitors Fed to Three Species of Leafrollers (Lepidoptera: Tortricidae)

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The larvae of 3 leafroller species-Epiphyas postvittana (Walker), Planotorlrix octo (Dugdale), and Ctenopseustis obliquana (Walker)-were chronically fed 6 digestive enzyme inhibitors in artificial diets over a 2-wk period, and their growth rate and digestive enzyme activities were measured. The inhibitors were fed singly and in selected combinations. Three protease inhibitors were extracted from potatoes (proteinase inhibitorsl and 2-POTI and 2-and carboxypeptidase inhibitor-CPI) and the 4th was bovine pancreatic trypsin inhibitor (BPTI). The 2 a-amylase inhibitors were extracted from wheat, the dimer and tetrarner. POTI and BPTI alone significantly reduced the growth rate of E. postvittana and P. octo. Most combinations of inhibitors did not reduce growth rate further than the single most effective constituent. However, ingestion of any of the inhibitors affected digestive enzyme activity. a-Amylase inhibitors increased a-amylase activity (up to IO-fold). BPTI, either singly or in combination, reduced measurable trypsin activity (1O-fold) and raised chymotrypsin activity (up to 3-fold) in all species. In larvae chronically fed POTI or BPTI, in vitro tests showed that the sensitivity of caseinase and chymotrypsin to protease inhibitors was unchanged. However, a very small amount of insensitive trypsin was produced. Because larval growth rate was so rarely significantly affected when inhibitors were added to the diet, whereas major enzyme activities were significantly altered, the question of compensation of one digestive enzyme for another is discussed.

Document Type: Research Article

Publication date: December 1, 1998

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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