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Digestion of carbohydrates and proteins in the alimentary canal ofCybister tripunctatus asiaticus Sharp. andPoecilocerus pictus Fabr.

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Proceedings / Indian Academy of Sciences

Abstract

Studies on the digestion and absorption of sugars and proteins were made,in vivo, in two insects,Cybister tripunctatus asiaticus Sharp., a carnivorous aquatic beetle, andPoecilocerus pictus Fabr., a grasshopper.Cybister digested only starch;Poecilocerus digested maltose and sucrose. In both insects the foregut was the chief site of carbohydrate digestion. InCybister, glucose was absorbed by the anterior midgut; inPoecilocerus, gastric caeca was the site of absorption of glucose and fructose.

Protein digestion was first initiated in the foregut of both insects and completed in the midgut. Amino acids were absorbed by the posterior midgut region in both insects. The feeding habits of both insects had no influence on the determination of sites of digestion and absorption.

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Author notes

  1. G. Subba Rao

    Present address: Department of Zoology, D.A.V. College, Muzaffarnagar, U.P.

Authors and Affiliations

  1. Department of Zoology, Birla Institute of Technology and Science, Pilani

    G. Subba Rao

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  1. G. Subba Rao
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Additional information

Communicated by Dr. B. S. Chauhan,f.a.sc.

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Rao, G.S. Digestion of carbohydrates and proteins in the alimentary canal ofCybister tripunctatus asiaticus Sharp. andPoecilocerus pictus Fabr.. Proc. Indian Acad. Sci. 76, 212–218 (1972). https://doi.org/10.1007/BF03051319

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  • DOI: https://doi.org/10.1007/BF03051319

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