Journal Article

Physiological Significance of the Structure and Components of the Apoplast Canal System for Water Absorption in Plants

Shoji Mizuno and Akiko Mizuno

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 43, issue 6, pages 614-618
Published in print June 2002 | ISSN: 0032-0781
Published online June 2002 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcf073
Physiological Significance of the Structure and Components of the Apoplast Canal System for Water Absorption in Plants

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The non-linear differential equation that describes the coupling between water transport and solute transport in the apoplast canal system in plants was proposed by Katou and Furumoto in 1986. In the present paper, we analytically solved the equation in order to find the law describing the canal system. In the canal system, water transport is regulated linearly by solute transport under physiological conditions. The approximate solution of the differential equations defines the conditions of the structure and components of the apoplast canal for optimal water absorption. Water absorption during cell elongation in plants requires that the apoplast canal be composed of a cell wall with an appropriate diffusion coefficient for solute.

Keywords: Keywords: Apoplast canal — Cell membrane — Cell wall — Diffusion coefficient — Local osmosis — Water absorption.; Abbreviations: x, position along the apoplast canal (x = 0 for the center of the canal, x = λ for the right end of the canal and x = –λ for the left end of the canal) (m); v(x), flow velocity of the fluid in the apoplast canal (m s–1); Lp, hydraulic conductivity of the cell membrane (m s–1 Pa–1); λ, length of the apoplast canal (m); δ, thickness of the apoplast canal (m); Ci, osmotic concentration in the symplast or cell (mol m–3); Ca, osmotic concentration in the apoplast canal (mol m–3); Pi, hydrostatic pressure in the symplast (Pa); Pa, hydrostatic pressure in the apoplast canal (Pa):D, solute diffusion coefficient in the apoplast canal (m2 s–1); Is, net solute influx into the symplast per unit area across the cell membrane in contact with the apoplast canal (mol m–2 s–1); Iv, average of the water influx into the symplast, per unit area across the cell membrane in contact with the apoplast canal (m s–1); R, gas constant (J mol–1 K–1); T, absolute temperature (K).

Journal Article.  2279 words.  Illustrated.

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

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