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The defensive secretion produced in the metathoracic tracheal glands of the grasshoppers, Romalea guttata and Taeniopoda eques , contains a diversity of proteinase inhibitors. The exudate contains inhibitors of trypsin, chymotrypsin, cathepsin G, papain and pancreatic and leukocyte elastases. The inhibitory profile of the secretion differs markedly from that of the hemolymph both, in terms of antiproteolytic activities and isoinhibitor composition. We suggest that these proteinase inhibitors may constitute a complementary defense system, for example, directed against diverse entomopathogenic fungi that characteristically attack grasshoppers. |
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