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How does suberin help protect underground plant parts and wounded tissues?
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Cell wall
Cutaway drawing of a plant cell, showing the cell wall and internal organelles.
Suberin is a complex biopolyester composed of fatty acids and aromatic compounds that functions as a protective barrier in plant anatomy.1
In underground plant parts, suberin acts alongside waxes to form a surface barrier that protects the tissue. Its role is equally critical in response to injury: when a plant is wounded, the synthesis of suberin is stimulated in the cells surrounding the damage. This process effectively seals off the wound surface, which serves two primary protective functions:1
- It creates a physical barrier that helps prevent the invasion of pathogens, such as bacteria and fungi.1
- It protects the underlying, exposed cells from dehydration.1
By forming these tight, cross-linked three-dimensional networks, suberin reinforces the cell wall, ensuring the plant remains resilient against environmental stressors and biological threats.1