Abstract
Young growing barley seedlings contain trypsin and chymotrypsin proteinase inhibitors in their leaf juices. The amount of chymotrypsin inhibitor varies greatly while trypsin inhibitor content is nearly the same in all varieties tested. Compana (CI5438) barley has much more total inhibitor than does Trebi (CI 936), Titan (CI 7055), Horn (CI 926), Hiproly (CI 3947) and Hiproly Normal (CI 4362). The distribution of inhibitors in different barley varieties correlates with the severity of grasshopper damage observed by other workers. Barley leaves could not be induced to accumulate proteinase inhibitors after excision and incubation, wounding, or absorption of crude “proteinase inhibitor inducing factor” preparations. Grasshopper damage experiments as related to proteinase inhibitor should be done in the field using yield as the correlative factor.
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