Plant Physiol.
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Plant Physiology 58:618-621 (1976)
© 1976 American Society of Plant Biologists

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Articles

Starch Degradation in the Cotyledons of Germinating Lentils

Jorge Fernández Tárrago and Gregorio Nicolás1

a Departamento de Fisiología Vegetal, Facultad de Farmacia, Universidad de Santiago de Compostela, Spain

Starch, total amylolytic and phosphorylase activities were determined in lentil cotyledons during the first days of germination. Several independent criteria show that the amylolytic activity is due mainly to an amylase of the {alpha} type. Starch is degraded slowly in the first days; during this time, {alpha}- and beta-amylase activity are very low, while phosphorylase increases and reach a peak on the 3rd day. On the 4th day, there is a more rapid depletion of starch which coincides with an increase in {alpha}-amylase activity. By polyacrylamide gel electrophoresis of the crude starch-degrading enzyme, five bands were obtained: one phosphorylase, three {alpha}-amylases, and one beta-amylase. Based on their heat lability or heat stability, two sets of {alpha}-amylase seem to exist in lentil cotyledons.

1 Present address: Departamento de Fisiología Vegetal, Universidad de Salamanca, Facultad de Ciencias, Spain.






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Copyright © 1976 by the American Society of Plant Biologists