Journal Article

Silicon-Induced Changes in Viscoelastic Properties of Sorghum Root Cell Walls

Taiichiro Hattori, Shinobu Inanaga, Eiichi Tanimoto, Alexander Lux, Miroslava Luxová and Yukihiro Sugimoto

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 44, issue 7, pages 743-749
Published in print July 2003 | ISSN: 0032-0781
Published online July 2003 | e-ISSN: 1471-9053 | DOI: https://dx.doi.org/10.1093/pcp/pcg090
Silicon-Induced Changes in Viscoelastic Properties of Sorghum Root Cell Walls

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry

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Silicon is deposited in the endodermal tissue in sorghum (Sorghum bicolor L. Moench) roots. Its deposition is thought to protect vascular tissues in the stele against invasion by parasites and drying soil via hardening of endodermal cells. We studied the silicon-induced changes in mechanical properties of cell walls to clarify the role of silicon in sorghum root. Sorghum seedlings were grown in nutrient solution with or without silicon. The mechanical properties of cell walls were measured in three separated root zones: basal, apical and subapical. Silicon treatment decreased cell-wall extensibility in the basal zone of isolated stele tissues covered by endodermal inner tangential walls. The silicon-induced hardening of cell walls was also measured with increases in elastic moduli (E) and viscosity coefficients (η). These results provided new evidence that silicon deposition might protect the stele as a mechanical barrier by hardening the cell walls of stele and endodermal tissues. In contrast to the basal zone, silicon treatment increased cell-wall extensibility in the apical and subapical zones with concomitant decrease in E and η. Simultaneously, silicon promoted root elongation. When root elongation is promoted by silicon, one of the causal factors maybe the silicon-enhanced extensibility of cell walls in the growing zone.

Keywords: Keywords: Cell wall — Extensibility — Growth — Root — Silicon — Sorghum.; Abbreviations: AE, apical elongation; AM apical maturation; BM, basal maturation; ITW, inner tangential walls.

Journal Article.  4675 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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