guard cells

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guard cells

one of a pair of specialized epidermal cells forming a pore (stoma) at the leaf surface. See STOMA for a description of how the stomatal aperture is regulated.
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Cell size measurement: Size (Length & breadth) of epidermal cells and guard cells were measured with ocular micrometer under high power magnifications with the help of "stage-ocular micro-metery" and "Motic Images plus 2.
III depicts the healthy as well as damaged epidermal and guard cells of Bougainvillea spectabilis at control and polluted zones, respectively.
3C, 3D, 4A, 4C, 4D), with two large guard cells surrounding the stoma on either side (Figs.
Therefore both ROS and NO are produced in response to pathogen attack (Dumer & Klessig, 1999) and also in guard cells in response to ABA (Neill et al.
Counting chloroplasts in guard cells of most higher plants is easy, or at least not very difficult.
Previous research in Schroeder's laboratory had identified that "anion channels" in the guard cells are essential for closing stomatal pores.
It has been assumed that the guard cells forming the pore have sophisticated sensory and information processing systems making use of light and other environmental cues to adjust the pores.
By adding normal carbonic anhydrase genes designed to work only in guard cells, they were able to restore the CO2-triggered pore-tightening response in mutant plants.
scattered; short and elongate terminal cells overarching guard cells.
that of the guard cells measured by Pant and Nautiyal (1963) in Dioon
The pair of cells adjacent to the guard cells may nor be distinguishable from other epidermal cells except by their proximity pattern (neighboring cells), or they may be different in shape, usually narrower or more angular (subsidiary cells).
Stomata with long guard cells are sunken under a cycle of subsidiary cells [ILLUSTRATION FOR FIGURE 2J, K OMITTED].