Biochemical Genetics

, Volume 21, Issue 7–8, pp 713–724 | Cite as

Genetics of insect hemolymph α-mannosidase in the silkworm, Bombyx mori

  • Shigeru Kimura


The genetics of hemolymph α-mannosidase was investigated in the silkworm, Bombyx mori. By selecting individuals showing either high or low enzyme activities, homozygotes were separated, with activities varying about five-fold. No differences in the activities of β-galactosidase and β-N-acetylglucosaminidase were observed. Thus, it seems that high- and low-enzyme silkworms (High and Low lines) share the same genetic background except for the gene concerning the activity of α-mannosidase. The synthesis of the enzyme is controlled by an autosomal allele. Furthermore, expression of the gene varies from tissue to tissue, and there is no correlation between enzyme activity and growth rate. The difference in activity between High and Low lines is due to the amount of active enzyme, not to an endogeneous activator or inhibitor. There was no isozymic difference in α-mannosidase.

Key words

insect α-mannosidase genetic variation enzymic characterization 


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Copyright information

© Plenum Publishing Corporation 1983

Authors and Affiliations

  • Shigeru Kimura
    • 1
  1. 1.The Sericultural Experiment StationYatabe, IbarakiJapan

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