CELL WALL METABOLISM I. HEMICELLULASES OF BROMUS SEEDS

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Summary

Readily extractable hemicelluloses account for approximately 14% of the dry weight of grains of five species of Bromus. In B. mollis, although 10% of cellulose is present in the whole grain, only one-eighth of this cellulose is located within the true seed, the remainder being restricted to the husk. Crude preparations of enzymes extracted from B. mollis can rapidly solubilize and degrade pentosan and hexosan hemicelluloses but are without apparent effect on suspensions of cellulose, and there appears to be no real evidence for the action of a true cellulase during germination.

Extracts of Bromus seeds are also extremely active in transglucosylation and can readily catalyse synthesis of β-linked oligosaccharides from 1% solutions of cellobiose.

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