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Cork cambium is the protective tissue of a stem. What mechanism does it use to protect the stem? Deposits of water in the cork cambium act as a barrier and protect the stem from water loss, physical damage, and invasion of pathogens. Deposits of minerals in the cork cambium act as a barrier and protect the stem from water loss, physical damage, and invasion of pathogens. Deposits of oils or waxes in the cork cambium act as a barrier and protect the stem from water loss, physical damage, and invasion of pathogens.
The cork cambium starts to generate numerous parenchyma cells toward the surface, in most cases at the level of a stoma. These thin-walled parenchyma cells, which eventually degenerate, force an interruption of the sealing created by the cork layer and focus an opening for gas-exchange.