In plants, a specialized cell on the undersurface of leaves for controlling gas exchange and water loss. Guard cells occur in pairs and are shaped so that a pore, During warm weather, when a plant is in danger of losing excessive water, the guard cells close, cutting down evaporation from the interior of the leaf.
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www.tiscali.co.uk/reference/encyclopaedia/hutchinson/m0...
www.tiscali.co.uk/reference/encyclopaedia/hutchinson/m0035144.html
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The table shows the osmotic pressure measured at different times of day in typical guard cells. The osmotic pressure within the other cells of the lower epidermis remained constant at 150 lb/in2. When the osmotic pressure of the Most of the living cells in a plant have at least part of their surface exposed to air.
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users.rcn.com/jkimball.ma.ultranet/BiologyPages/G/GasEx...
users.rcn.com/jkimball.ma.ultranet/BiologyPages/G/GasExchange.html
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Guard cells respond to most of the classically known hormonal stimuli in plants, illustrating that presently unidentified but essential plant receptors and...
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biology.ucsd.edu/labs/schroeder/clickablegc.html
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Regulation of Guard Cells Water vapour also escapes from the stoma by the process of Transpiration. As water transpires, other water molecules are pulled up through the plant behind it.
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www.tvdsb.on.ca/westmin/science/sbioac/plants/stoma.htm
www.tvdsb.on.ca/westmin/science/sbioac/plants/stoma.htm
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Environmental Issues question: Describe how guard cells assist the plant in controlling water loss? an open stomate allows water to leave through...
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wiki.answers.com/Q/Describe_how_guard_cells_assist_the_...
wiki.answers.com/Q/Describe_how_guard_cells_assist_the_plant_in_controlling_water_loss
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The plant epidermis consists of three main cell types: pavement cells, guard cells and their subsidiary...
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en.wikipedia.org/wiki/Epidermis_(botany)
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The ABA-induced binding to the 61 kDa protein occurred only in guard cells, and reached a maximum within 3 min at 1 µM ABA. The 61 kDa protein localized in the cytosol. ABA induced the binding of endogenous vf14-3-3a to the 61 kDa protein in guard cells.
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pcp.oxfordjournals.org/cgi/content/abstract/48/8/1182
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2Henan Key Laboratory of Plant Stress Biology, ABA, H2O2 and NO had slight inhibitory effects on the phosphorylation of phototropins, which are blue light receptors in guard cells. NO inhibited neither fusicoccin-induced H+ pumping in guard cells nor H+ transport by H+-ATPase in the isolated membranes.
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pcp.oxfordjournals.org/cgi/content/abstract/48/5/715
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CO(2)-triggered chloride release from guard cells in intact fava bean leaves. Kinetics of the onset of stomatal closure. ABA depolarizes guard cells in intact plants, through a transient activation of R- and S-type anion channels. Plant J. 2007 Apr; 50(1):29-39. Epub 2007 Feb 22.
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www.ncbi.nlm.nih.gov/pubmed/12376658
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