Gibberellic acid and the fine structure of barley aleurone cells

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Abstract
This paper describes the ultrastructural changes in barley aleurone cells following exposure to gibberollic acid (GA3) for 10–12 hr and longer. These changes involve a further proliferation of the endoplasmic reticulum (ER), distention of the endoplasmic reticulum (ER) cisternae (12–16 hr of GA3) and proliferation of vesicles from the ER and dictyosomes (14–22 hr). Accompanying these changes is a reduction in the size of the aleurone grains and a decrease in the number of spherosomes. Plastids and microbodies however appear to increase in number during this period of GA3 treatment. The relevance of these ultrastructural changes to GA3-stimulated synthesis of hydrolases is discussed.