クリープ測定による根の細胞壁の粘弾性解析

概要

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A plant root is organized by three consecutive zones of cell arrays, cell division, cell elongation and cell maturation zones. The gradient of cell age along the root axis may play an important role in the growth of roots intruding into the soil. Since the growth rate of plant cell is limited by cell walls, the cell-wall extensibility of elongation zone is one of the major regulators of root growth. This article overviews the analytical methods of mechanical properties of plant cell walls focusing on the root growth which is affected by pH, gibberellin, aluminum and silicon. We have developed the method to analyze the creep extension of every one-mm zone of root cell wall in vitro by using a Kelvin-Voigt-Burgers' six-element model. The gradient of cell age along root axis and the cell wall extensibility strongly correlated with viscoelastic parameters obtained by this method. The extensibility of root cell walls increased under low pH, with specific decline of viscosity coefficient(η<SUB>0</SUB>). It was also affected by gibberellin, aluminum and silicon treatment. The most remarkably affected was η<SUB>0</SUB> among the six parameters by these factors. Our goal will be to identify the molecular sites of cell wall polymers that are responsible for these viscoelastic parameters.
日本バイオレオロジ-学会の論文