Journal of Experimental Botany, Vol 50, 1267-1280, Copyright © 1999 by Oxford University Press
L Schreiber, K Hartmann, M Skrabs and J Zeier
Based on the characterization of the chemical composition of endodermal and
hypodermal cell walls isolated from seven monocotyledonous and three
dicotyledonous plant species, a model of the composition of apoplastic
barriers in roots is proposed. Depending on the species, endodermal and
hypodermal cell walls of roots contained varying amounts of the biopolymers
suberin, lignin, cell wall proteins, and carbohydrates. Although analysis
of the chemical composition of these apoplastic barriers of roots is now
possible, it is pointed out that conclusions from these data concerning the
functional properties of these cell walls can not easily be drawn. However,
in analogy to suberized periderms it is argued that the suberin should play
a role in establishing an apoplastic transport barrier in roots, albeit not
a perfect barrier. Furthermore, due to the combined occurrence of suberin,
lignin and cell wall proteins it is argued that endodermal and hypodermal
cell walls also have an important function as barriers towards pathogens.
Finally, it is pointed out that additional experimental approaches
combining the investigation of transport properties and of the chemical
composition of apoplastic transport barriers in roots are necessary before
the function of endodermal and hypodermal cell walls in roots can be fully
understood.Key words: Apoplast, Casparian strip,
endodermis, hypodermis, lignin, root, transport, suberin
ARTICLES
Review article. Apoplastic barriers in roots: chemical composition of endodermal and hypodermal cell walls
Julius-von-Sachs-Institut fur Biowissenschaften, Lehrstuhl fur Botanik II, Universitat Wurzburg, Julius-von-Sachs Platz 3, Mittlerer Dallenbergweg 64, D-97082 Wurzburg, Germany; Corresponding author e-mail: lukas@botanik.uni-wuerzburg.de
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