THE ROOT ENDODERMIS: FINE STRUCTURE AND FUNCTION

Abstract

Root endodermal cells of Convolvulus arvensis were observed to determine their role in the radial transport of minerals, water, and hormones. Each cell is characterized by a narrow band extending along the radial and transverse walls, the Casparian strip. It is chemically distinguishable from the rest of the wall by the presence of suberin and lignin. Suberin prevents the passage of water and aqueous solutes. The endodermal cell structure does not appear sufficiently specialized for active ion uptake.