Casparian strip
In plant anatomy, the Casparian strip is a band of cell wall material deposited in the circumfrential and longitudinal walls of the endodermis, and is chemically different from the rest of the cell wall - the cell wall being made of lignin and without suberin - whereas the Casparian strip is made of suberin and sometimes lignin. The Casparian strip blocks the passive flow of materials such as water and solutes from passing into the stele of a plant thereby forcing those to pass through the cell walls of the endodermis where their passage is mediated by gates for each specific nutrient. The band was first recognized as a wall structure by Robert Caspary (1818–1887).
The strip forms during the early development of the cell and is a part of the primary wall of the cell of the endodermis. It varies in thickness and is often much thinner than the wall in which it occurs. It is typically located closer to the inner tangential wall than to the outer wall.
