Guard cells

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(Bot.) the bordering cells of stomates; they are crescent-shaped and contain chlorophyll.

See also: Guard

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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Each stoma is surrounded by two specialized guard cells that open and close the central gas exchange pore (fig.
These consistently showed that stomata occurred in rows and were paracytic--the stomata were bordered by two subsidiary cells with their longitudinal axes parallel to those of the stomal pore and guard cells (Prabhakar 2004), although they can be tetracytic as well (Ruddall and Chase 1996) i.e.
The lengths and widths of stomatal pores and guard cells were measured using ocular micrometer.
In her first body paragraph, Bridget focused on each of the two cells in turn: firstly root hair cells and then guard cells. This type of patterning of themes across a text contributes to the text's predictability' (Humphrey & Droga, 2003, p.
In all treatments, in an environment with natural light, the stomata have guard cells with external periclinal walls that present a rather sharp thickening, forming a crest around the external atrium, and underdeveloped substomatic chambers (Figures 3A, E, 4A, C, D).
Epidermal cell shape and thickness; stomata type, location, and distribution; trichomes shape, size, and distribution; the arrangement and position of accessory cells surrounding the guard cells as well as the type of phloem and xylem vessels present were the qualitative features considered.
A variety of characters like epidermal cells, subsidiary cells, guard cells, trichomes, macro-hairs, micro-hairs and stomata were used as a tool for the taxonomic grouping of different species.
Other than affecting the bulliform cells, water deficit also causes the guard cells to lose their turgor pressure [66], thus leading to stomatal closure [67].
The accumulation and release of potassium by stomata guard cells lead to changes in their turgid, resulting in stomata opening and closing (Fletcher et al., 2007).
As with GMCs, which divide symmetrically to form a pair of guard cells, the SCs of many grass species also divide symmetrically to form a short-cell pair (Fig.
AtMYB60 was specifically expressed in guard cells, and its expression was negatively modulated by drought.