Suberin, present in the walls of cork cells, provides a waterproof barrier that prevents the movement of gases and water through the outer layer of the plant.
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Cork is composed of dead cells that are compactly arranged without intercellular space. These cells have walls containing suberin, which makes them impervious to gases and water.
Xylem fibres provide structural support to the plant, reinforcing the xylem tissue and helping to maintain the plant’s rigidity and stability, essential for standing upright and withstanding external forces.
Xylem parenchyma stores food and nutrients within the vascular tissue, providing essential metabolic support and maintaining the health and functionality of the xylem in the plant.
In the vascular bundle of a plant stem, different types of cells can be observed, including tracheids, vessels, xylem parenchyma, and xylem fibres.