Abstract
The release of soluble carbohydrates from isolated cell wall of maize (Zea mays L.) was investigated in the range of pH 1 to 8.5. The pH profile demonstrated two peaks, a broad peak at pH 6 due to enzymatic breakdown of β-glucan to monosaccharides (wall autolysis) and a sharp peak at pH 2.5 due to acid-mediated, nonenzymatic liberation of macromolecular β-glucan from the wall. The pH dependence of acid-induced growth and cell-wall extensibility of coleoptile segments closely agrees with the pH dependence of acid-mediated β-glucan solubilization in the isolated wall. However, there is no evidence that enzymatic or nonenzymatic β-glucan solubilization is involved in the mechanism of auxin-mediated growth.
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Selected References
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- Cosgrove D. J. Characterization of long-term extension of isolated cell walls from growing cucumber hypocotyls. Planta. 1989;177:121–130. [PubMed] [Google Scholar]
- Hoson T., Nevins D. J. beta-d-Glucan Antibodies Inhibit Auxin-Induced Cell Elongation and Changes in the Cell Wall of Zea Coleoptile Segments. Plant Physiol. 1989 Aug;90(4):1353–1358. doi: 10.1104/pp.90.4.1353. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Huber D. J., Nevins D. J. beta-d-Glucan Hydrolase Activity in Zea Coleoptile Cell Walls. Plant Physiol. 1980 May;65(5):768–773. doi: 10.1104/pp.65.5.768. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Loescher W., Nevins D. J. Auxin-induced Changes in Avena Coleoptile Cell Wall Composition. Plant Physiol. 1972 Nov;50(5):556–563. doi: 10.1104/pp.50.5.556. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Métraux J. P., Taiz L. Cell wall extension in Nitella as influenced by acids and ions. Proc Natl Acad Sci U S A. 1977 Apr;74(4):1565–1569. doi: 10.1073/pnas.74.4.1565. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Rayle D. L., Cleland R. Control of plant cell enlargement by hydrogen ions. Curr Top Dev Biol. 1977;11:187–214. doi: 10.1016/s0070-2153(08)60746-2. [DOI] [PubMed] [Google Scholar]