guard cell


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Related to guard cell: photosynthesis

guard cell

[′gärd ‚sel]
(botany)
Either of two specialized cells surrounding each stoma in the epidermis of plants; functions in regulating stoma size.
References in periodicals archive ?
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.
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.
Instead of being flush with the epidermal cells, the guard cells are recessed.
Zhang and Outlaw (2001) reported that stressing Vicia faba roots could change ABA concentrations at the guard cell apoplast and that the apoplastic guard cell ABA concentration correlated with changes in stomatal aperture more effectively than did the guard cell symplastic fraction.
Hence, the chloroplast numbers of mature guard cells may, to some degree, be representative of meristematic [G.
The open stomata were 11 and 4 closed stomata were present, average length of guard cells was 42.
In hot, dry conditions, the guard cells become progressively more restrictive in their opening to protect the leaf from losing too much water vapor and thus jeopardizing the chloroplasts' survival.
The structure of the stomata and their subsidiary cells in the studied species is the same as that described by Greguss (1968) and Acuna-Catillo & Marin-Mendez (2012) for other species of the genus: sunken guard cells and raised subsidiary cells that form the walls of the epistomatic chamber.
We show that the use of the CMLD may enhance the detection performance and particularly if we add guard cells in the range direction.
In addition, guard cells surround the stomata, which are the small holes on the undersides of leaves that allow carbon dioxide to enter and oxygen to be released.