In: Biology
3. explain the location and role of the endodermis in regulating the movement of substances into and out of the root's vascular cylinder. You musr use, but are not limited to the following: Casparian strip, plasma membrane, endodermis, symplastic, apoplastic.
Endodermis is present In the inner layer of the cortex present I’m the plants. It is composed of compact cells, where the outer ring is composed of casparian strip, that is hydrophobic in nature and this hydrophobicity would be restricting the apoplastic water flow in the cells. The endodermis acts as the boundary present between the Steele as well as the cortex.
The endodermis would be preventing water or solutes to pass through this layer. Water would only be passing through the endodermis via crossing these cells. The water has to enter into the symplast present inside the endodermis. Inside the endodermis cellsm there is presence of passage cells, where there would be thin walls along with casparian strips that act in the form of waterproof cells. Passage cells carry solutes in the form of mg and ca, through the Steele, such that it would mice on to the transpiration system.
Also, endodermal cell’s have starch granules that would be acting as food storage in the plants. Passage cells are dimorphic. There passage cells do not contain Suberin lamellae as well as thick walls of cellulose. Due to their cytoplasmic structure and close proximity to xylem, the exodermal cell’s would be carrying out ion uptake.