Abstract
α-Glucosidase which hydrolyzed sucrose and trehalose and β-glucosidase which acted on phenolic glucosides such as arbutin and salicin were found to occur in the salivary glands of Nephotettix cincticeps UHLER, Inazuma dorsalis MOTSCHULSKY, Laodelphax striatellus FALLEN and Nilaparvata lugens STAL. Cellulase (using carboxymethyl cellulose as a substrate), pectinase (pectic acid), amylase (soluble starch), α-galactosidase (meliiose), β-galactosidase (lactose) and α-fructofuranase (raffinose) were not detected. In the salivary glands of N. cincticeps and I. dorsalis both the α-and β-glucosidase activities were localized in the III-cells of the principal gland by histological methods. In the salivary glands of L. striatellus and N. lugens the α-glucosidase was demonstrated to originate in the G-follicle in the principal gland, but β-glocosidase in the B- and D-follicles.
