Endodermis - Endodermis., , . wate

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Endodermis . The innermost layer of the cortex is the  endodermis , which is readily identifiable by  the presence of  Casparian strips , bands of suberin present on transverse and radial walls of its  cells—the walls perpendicular to the surface of the root. The endodermis regulates the passage of  water and dissolved substances by forcing them to move through living plasma membranes and  plasmodesmata and not simply diffuse through the porous cell walls. The absorption and  translocation of materials is thus selective; not everything in the surrounding soil gets through and  into the plant body. An endodermis almost always is present in roots and generally never in stems.  Storage parenchyma . The bulk of the cortex consists of thin-walled, living parenchyma cells, which  store  starch  and other substances. The cells expand or shrink as materials move in and out of their 
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  • Fall '08
  • Farr
  • primary xylem, additional pericycle cells, living plasma membranes, cork cambium originate, porous cell walls.

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