Endodermis
Endodermis
The Endodermis (/ɛnˌdoʊˈdɜːrmɪs/; from the Greek endo meaning "inside" and dermis meaning "skin") is the central, innermost layer of cortex in some land plants.
Etymology
The term "Endodermis" is derived from the Greek words endo, meaning "inside", and dermis, meaning "skin". This is reflective of the endodermis' role as the innermost layer of the cortex in plants.
Function
The endodermis serves as a barrier between the cortex and the pericycle, which is the outermost layer of the stele. It controls the flow of nutrients and water into and out of the stele, thereby regulating the plant's growth and development.
Structure
The endodermis is composed of a single layer of compactly arranged cells, which are typically shaped like bricks when viewed in cross-section. These cells are surrounded by a band of waterproof material known as the Casparian strip, which prevents the passive flow of materials into and out of the stele.
Related Terms
- Cortex: The layer of tissue immediately outside the endodermis.
- Pericycle: The outermost layer of the stele, located just inside the endodermis.
- Stele: The central part of the root or stem containing the vascular tissue.
- Casparian strip: A band of cell wall material deposited in the radial and transverse walls of the endodermis, and is impervious to water and dissolved minerals.
See Also
External links
- Medical encyclopedia article on Endodermis
- Wikipedia's article - Endodermis
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