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The cellulase content of 15 species of entodiniomorphid protozoa, mixed bacteria and plant debris isolated from the ovine rumen

Published online by Cambridge University Press:  27 March 2009

G. S. Coleman
G. S. Coleman
Affiliation:
Biochemistry Department, Agricultural and Food Research Council Institute of Animal Physiology, Babraham, Cambridge, CB2 4AT
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Summary

The cellulolytic activity of cell-free extracts of 15 species of entodiniomorphid protozoa grown in vitro and under two conditions in vitrohas been measured using six different assays with substrates varying in complexity from carboxymethylcellulose to microcrystalline cellulose. Although there were differences between the assays, the highest activities were found in Eudiplodinium maggii, Epidinium ecaudatum caudatum and Ostracodinium obtusum bilobum with little or no activity in five Entodiniumspp. There was no consistent effect of growth conditions on cellulase content although with protozoa grown in vitro those grown on grass alone tended to contain more cellulase than those grown on starch and grass.

A survey of methods for the release of cellulase from other rumen fractions was made and mild treatment with ultrasound of the fraction suspended in water gave the maximal release of enzyme with the highest specific activity. Using this method 62% of the total rumen cellulase was found in the protozoal fraction and 27% was associated with the plant debris in a normal sheep, fed on hay and oats, with an A-type protozoal population.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 104 , Issue 2 , April 1985 , pp. 349 - 360
Copyright
Copyright © Cambridge University Press 1985

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