Abstract ment by forming extensive surface areas. There are clear similarities and differences in functional properties and Based on the characterization of the chemical com-structural demands of these above-ground and below-position of endodermal and hypodermal cell walls ground interfaces across which interactions occur. Both isolated from seven monocotyledonous and three dico-interfaces have in common that they must protect the tyledonous plant species, a model of the composition living tissue from infection by pathogens ( Kerstiens, 1996; of apoplastic barriers in roots is proposed. Depending Agrios, 1997). The leaf epidermis carries stomata allowing on the species, endodermal and hypodermal cell walls the regulation of gas exchange and transpiration (Larcher, of roots contained varying amounts of the biopolymers
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Lukas Schreiber (1999) studied this question.