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The turgor pressure of guard cells is controlled by movements of large quantities of ions and sugars into and out of the guard cells. Guard cells have cell walls of varying thickness(its inner region, adjacent to the stomatal pore is thicker and highly cutinized [7]) and differently oriented cellulose microfibers, causing them to bend outward ...
Stoma in a tomato leaf shown via colorized scanning electron microscope image A stoma in horizontal cross section The underside of a leaf. In this species (Tradescantia zebrina) the guard cells of the stomata are green because they contain chlorophyll while the epidermal cells are chlorophyll-free and contain red pigments.
The guard cells are bean-shaped in surface view, while the epidermal cells are irregular in shape; The guard cells contain chloroplasts, so they can manufacture food by photosynthesis (The epidermal cells of terrestrial plants do not contain chloroplasts) Guard cells are the only epidermal cells that can make sugar. According to one theory, in ...
These cells, along with the epidermal guard cells of the stoma, form a system of air spaces and chambers that regulate the exchange of gases. In some works, the cells of the leaf epidermis are regarded as specialised parenchymal cells, [ 4 ] but the modern preference has long been to classify the epidermis as plant dermal tissue , and ...
Ceruminous glands are simple, coiled, tubular glands made up of an inner secretory layer of cells and an outer myoepithelial layer of cells. [1] They are classed as apocrine glands. The glands drain into larger ducts, which then drain into the guard hairs that reside in the external auditory canal. [2]
Several cell types may be present in the epidermis. Notable among these are the stomatal guard cells that control the rate of gas exchange between the plant and the atmosphere, glandular and clothing hairs or trichomes, and the root hairs of primary roots. In the shoot epidermis of most plants, only the guard cells have chloroplasts ...
TPK channels, a less-studied but significant family, modulate potassium flux in response to mechanical forces. This activity influences guard cell function, root cell turgor, and other mechanical responses critical to maintaining cellular homeostasis under stress. [8]
The pore is formed by two guard cells, which control the size of the pore by swelling in response to the activity of the H +-ATPase. Opening and closure of the pore is partly controlled by regulation of the H +-ATPase. Plant movements. Like the somatal pore, other movements of plant organs are controlled by motor cells' changing cell turgor.