Gibberellic Acid and Ion Release from Barley Aleurone Tissue Evidence for Hormone-dependent Ion Transport Capacity
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TLDR
Evidence suggests that RNA and protein synthesis are required to establish and maintain ion release capacity of aleurone cells and suggest a strong correlation between energy levels and ion transport capacity.Abstract:
The release of potassium, magnesium, and phosphate ions from aleurone cells of barley (Hordeum vulgare L. cv. Himalaya) is a gibberellic acid-dependent process. The release of these ions is preceded by a lag period of 6 to 8 hours after gibberellic acid addition. The effect of gibberellic acid on the release of ions is not mediated through an effect on ion solubilization. Thus, gibberellic acid does not apreciably affect the sum of extracted and released ions relative to controls. Rather, the effect of the hormone is on the release process itself. Inhibitors of oxidative phosphorylation when added with gibberellic acid or at times up to 6 hours after gibberellic acid inhibition release. When these inhibitors are added after ion release has begun, however, rapid efflux of ions occurs. These results suggest a strong correlation between energy levels and ion transport capacity. Inhibitors of RNA and protein synthesis also inhibit gibberellic acid-stimulated ion release. Evidence suggests that RNA and protein synthesis are required to establish and maintain ion release capacity of aleurone cells.read more
Citations
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References
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Journal ArticleDOI
Mineral Nutrition in Plants: Principles and Perspectives.
H. David Hammond,Emanuel Epstein +1 more
Journal ArticleDOI
The essential role of calcium in selective cation transport by plant cells
Journal ArticleDOI
Physiological Effects of Gibberellic Acid: I. On Carbohydrate Metabolism and Amylase Activity of Barley Endosperm
Gibberellic Acid-Induced Synthesis ofProtease by Isolated Aleurone Layers ofBarley'
TL;DR: In this article, the authors examined the production of protease by isolated aleurone layers of barley in response to gibberellic acid and found that the effect of the acid is to promote the simultaneous synthesis and secretion of a group of hydrolases.
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