Auxin and Wall Extensibility: Reversibility of Auxin-Induced Wall-Loosening Process

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Abstract
The reversible nature of the auxin-mediated loosening of the cell wall is shown by the ability of respiratory inhibitors to cause the loss of the auxin-induced increase in wall extensibility without affecting the basal extensibility of the wall. This reversibility makes it unlikely that wall loosening is mediated by enzymes, such as cellulase and β-glucanase, which degrade polysaccharides, since their action is essentially irreversible.