Suberin is a natural polymer found in the cell walls of certain plants, particularly in the bark and cork. It serves as a protective barrier, helping to prevent water loss and resist pathogens. This makes suberin an important component in the structure of cork oak and other plants that thrive in harsh environments. In addition to its protective functions, suberin plays a role in the formation of periderm, the outer protective layer of roots and stems. Its hydrophobic properties contribute to the plant's ability to manage water and nutrient uptake, making it essential for plant health and survival.