Abstract
Partially purified subabul trypsin inhibitor (STI) showed high level of thermotolerance and pH stability with a molecular weight of -15 kD. Bioassay results showed that STI is a strong inhibitor of Helicoverpa armigera larval gut proteinases. In vitro feeding experiments revealed 40% mortality in inhibitor fed larvae followed by 12 days extension in larval growth period and significant reduction in pupal weight. Differential activity staining for the larval gut proteolytic enzymes did not show any difference in the isoprotease pattern between the control and the larvae fed with STI.
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