It is surrounded by a cortex which is further enveloped by a highly specialized exodermis, most of which at maturity do not contain protoplasm.
2.
The exodermis is surrounded by velamen, consisting of one to several layers of cells, which can develop root hair under proper environmental conditions.
3.
The exodermis is thought to provide protection against water loss of the root to the soil, and also to serve as defense against microorganisms.
4.
The silicon uptake systems, Lsi1 ( TC # 1 . A . 8.12.2 ), and Lsi2 are expressed in roots, on the plasma membranes of cells in both the exodermis and the endodermis.
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