Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 7-Day Trial for You or Your Team.

Learn More →

Apoplastic Water and Solute Movement: New Rules for an Old Space

Apoplastic Water and Solute Movement: New Rules for an Old Space The history of the apop/ast, both the word and the concept, is traced from its invention by Munch (1930), through its adoption by the translocation physiologists as a gateway by which to feed pesticides, and the independent evolution of the free-space concept by ion-uptake physiologists. Both usages 0066-4294/95/0601-0215$05.00 CANNY helped spread the idea that the cell walls were freely permeable to flowing solutions. Recent work has produced six contradictions to the prevailing no­ tions of the rules that operate in the apoplast: (a) The flow of the apoplast is leaky, and the balance of the flow and leaks depends on vessel diameter. (b) Water leaves the vessels and enters the symplast faster than do some solutes, resulting in the accumulation of high concentrations of solutes at places called sumps. (c) Solutes diffuse away from sumps in the cell-wall apoplast at rates much slower than diffusion in water. (d) Ion concentrations in leaf vessels may be as high as 200 mM. (e) The intercellular-space apoplast of roots often contains solution with high concentrations of ions. if) The threshold of cavita­ tion of the flow-apoplast appears to be in the range of 1 to 2 bar below atmospheric, much less http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annual Review of Plant Biology Annual Reviews

Apoplastic Water and Solute Movement: New Rules for an Old Space

Canny, M J
Annual Review of Plant Biology , Volume 46 (1) – Jun 1, 1995
Download PDF
22 pages

Loading next page...
 
/lp/annual-reviews/apoplastic-water-and-solute-movement-new-rules-for-an-old-space-z80j1hYZff

References

References for this paper are not available at this time. We will be adding them shortly, thank you for your patience.

Publisher
Annual Reviews
Copyright
Copyright 1995 Annual Reviews. All rights reserved
Subject
Review Articles
ISSN
1040-2519
DOI
10.1146/annurev.pp.46.060195.001243
Publisher site
See Article on Publisher Site

Abstract

The history of the apop/ast, both the word and the concept, is traced from its invention by Munch (1930), through its adoption by the translocation physiologists as a gateway by which to feed pesticides, and the independent evolution of the free-space concept by ion-uptake physiologists. Both usages 0066-4294/95/0601-0215$05.00 CANNY helped spread the idea that the cell walls were freely permeable to flowing solutions. Recent work has produced six contradictions to the prevailing no­ tions of the rules that operate in the apoplast: (a) The flow of the apoplast is leaky, and the balance of the flow and leaks depends on vessel diameter. (b) Water leaves the vessels and enters the symplast faster than do some solutes, resulting in the accumulation of high concentrations of solutes at places called sumps. (c) Solutes diffuse away from sumps in the cell-wall apoplast at rates much slower than diffusion in water. (d) Ion concentrations in leaf vessels may be as high as 200 mM. (e) The intercellular-space apoplast of roots often contains solution with high concentrations of ions. if) The threshold of cavita­ tion of the flow-apoplast appears to be in the range of 1 to 2 bar below atmospheric, much less

Journal

Annual Review of Plant Biology – Annual Reviews

Published: Jun 1, 1995

There are no references for this article.