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The sequence in which a variety of enzymes and metabolites are affected by gibberellic acid after application of the hormone to aleurone layers of half seeds of barley (Hordeum vulgare var. Betzes) and half seeds of wheat (Triticum aestivum var. Gensee) was investigated. With barley aleurone layers the first hormonal effect observed was the increased secretion of soluble carbohydrate, some of which appears to be a glucan containing some beta-1,3 linkages. This was followed by increased oxygen consumption and increased secretion of ATPase, GTPase, phytase, phosphomonoesterase, phosphodiesterase, inorganic phosphate, carbohydrates other than amylase, peroxidase and amylase. Similar sequential effects were seen in wheat half seeds. Increased activity of alcohol dehydrogenase in barley seeds was elicited by the hormone but there was no effect on glucose-6-phosphate isomerase.

A Survey of the Sequence of Some Effects of Gibberellic Acid in the Metabolism of Cereal Grains