Co-Authors:
Ishaaya, I., Divisions of Entomology and Toxicology, The Volcani Center, Bet Dagan, Israel, Division of Entomology, University of California, Berkeley, 94720, Calif., United States
Meisner, J., Divisions of Entomology and Toxicology, The Volcani Center, Bet Dagan, Israel
Abstract:
Feeding of Styropor lamellae treated with 0.25 M maltose, sucrose, raffinose or melezitose by S. littoralis larvae induced amylase activity to 5-6 fold and invertase and protease activity to 2-3 that of the control. Melibiose induced amylase activity to about 4-fold and invertase and protease activity to 188% and 173%, respectively, that of the control. β-lactose stimulated the various digestive enzymes to various extents; cellobiose had practically no effect. Glucose and fructose induced the various digestive enzymes to about the same level but to a much higher extent than galactose. The feeding rate of the various sugar compounds except maltose, correlates well with their stimulating activity on the digestive enzymes. Maltose, which induced the larval digestive enzymes to about the same level as that of sucrose, elicited a considerably lower feeding response. The excretion index of sugars stimulating digestive enzymes and eliciting a feeding response, such as maltose, sucrose, raffinose and melezitose, is considerably lower than that of the other sugars. In a comparative test, sucrose, maltose and raffinose induced the various digestive enzymes to about the same level as their equivalent monosaccharide components. However, β-lactose and cellobiose, which have the same components as melibiose and maltose but differ in their configuration, affect the various enzymatic systems weakly. © 1973 Springer-Verlag.
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