Characteristics of the Process of Enzyme Release from Secretory Plant Cells

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Abstract
Secretion—the outward movement of molecules across the plasmalemma—of α-amylase by barley (Hordeum vulgare L. cv. Himalaya) aleurone layers is an energy-dependent process that is not directly dependent upon protein synthesis or RNA synthesis and does not appear to be under the direct control of gibberellic acid or abscisic acid. Release—the movement of the secreted α-amylase molecules through the walls into the surrounding medium—is apparently diffusion limited and is markedly dependent upon the presence of ions.