Fine Structural Changes in Barley Aleurone Cells During Gibberellic Acid-induced Enzyme Secretion

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Abstract
The fine structure of barley aleurone cells was studied in the enzyme secretion phase. An ultrastructural feature of this phase is the formation of stacked rough endoplasmic reticulum (rER), for such a structure was never found in cells during the enzyme synthesis phase. Other structural features frequently observed in the secretion phase were amoeboid-shaped nuclei, the stacked rER wound round the nucleus and mitochondria, and a stream of the stacked rER directed to the plasmamembrane.