Abstract
The aleurone layer of the seeds of gramineae is a secretory tissue surrounding the endosperm reserves of the seed. During germination, gibberellins from the embryo induce the aleurone layer cells to synthesize and secrete several hydrolases, including amylases and proteases that hydrolyze the reserve starch to maltose and glucose and the reserve proteins to amino acids. These end products of hydrolysis are transported to the growing regions of the embryo. In the intact germinating seed, the embryo, both the scutellum and the nodal region, synthesizes the gibberellins, probably GA, and GA that control the aleurone response. This is appropriate and logical, because it is the embryo that gains from an ordered mobilization of the endosperm reserves. Thus, the cereal grain provides a convenient system for the study of the plant's use of a hormone to integrate the various functions of the different tissues and organs.
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