what is the outer layer of a root called
Plant epidermis fulfils a basic protective function, but specialised cells within the epidermis have specific roles. The aerial epidermis originates in the shoot apical meristem, the root epidermis in the root apical meristem and the seedling epidermis arises by isolation of the outer layer during embryogenesis. Stomatal guard cells allow gas exchange, and their patterning is controlled by cell lineageâbased developmental mechanisms.