• S Sreekumar

      Articles written in Proceedings – Animal Sciences

    • Digestive enzyme secretion during metamorphosis inOryctes rhinoceros (Coleoptera: Scarabaeidae)

      S Sreekumar V K K Prabhu

      More Details Abstract Fulltext PDF

      Protease, amylase, lipase and trehalase are present in the larval and adult midguts ofOryctes rhinoceros; cellulase is absent. Invertase is present only in the adult. The presence of trehalase in the pupal midgut suggests that food digestion is not the normal function of gut trehalase. Quantitative studies reveal that protease and amylase in the third instar larvae reach very low levels as the larvae become older and consume little or no food. These two enzymes are not measurable in the non-feeding prepupa and pupa and reappear in the adult with commencement of feeding. Secretion of digestive enzymes is correlated with feeding.

    • Probable endocrine role of midgut tissue in stimulation of digestive enzyme secretion inOryctes rhinoceros (Coleoptera: Scarabaeidae)

      S Sreekumar V K K Prabhu

      More Details Abstract Fulltext PDF

      The effect of midgut epithelial extract on digestive enzyme secretion in the third instar larva ofOryctes rhinoceros was studied. Midguts dissected out from third instar larvae were cut at both ends, emptied of their contents, washed in insect saline, ligated at the open ends and incubated in a medium containing extract of 2 midgut epithelia/10 ml incubation solution. In control experiments midgut preparations were incubated in insect saline without midgut epithelial extract. After 30 min of incubation, the contents of the midgut preparations incubated with midgut epithelial extract showed increased secretion of protease and amylase when compared with controls. Digestive enzyme release into gut lumen appears to be due to the action of a hormone present in the midgut epithelium.

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