抄録
Activities of α-mannosidase, β-galactosidase and β-N-acetylglucosaminidase of silkworm haemolymph were examined for quantitative differences among four geographically different races and strains of Bombyx mori. Statistical analysis on a correlation of strains with the ratios of enzyme activities revealed that all strains were distinguishable by the index. α-Mannosidase levels were bimodally distributed in the four races, whereas β-galactosidase and β-N-acetyl-glucosaminidase showed a normal unimodal pattern. A difference in activity among the four races was found only for α-mannosidase which was significantly higher in the European race. No enzyme-deficient silkworm was found. Silkworms with extremely high and low activities were seen, suggesting that they were in a heterozygous state for glycosidases.