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The guard cells regulate the opening and closing of the stomata. Thus they control the exchange of gases between the leaf and the surrounding atmosphere. ... The photo shows the network of leaf veins in a maple leaf. Probably no cell in the spongy layer is more than two cells away from a vein.
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users.rcn.com/jkimball.ma.ultranet/BiologyPages/L/Leaf....
users.rcn.com/jkimball.ma.ultranet/BiologyPages/L/Leaf.html
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Regulation of Guard Cells ... The Guard cells control the stomatal openings in the epidermis of the leaf. ... When the stoma is open CO2 can diffuse into the leaf and enter the Calvin Cycle. The oxygen produced in photolysis, diffuses out ot the open stoma.
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www.tvdsb.on.ca/westmin/science/sbioac/plants/stoma.htm
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guard cell - one of a pair of sausage-shaped cells that surround a stoma (a pore in a leaf). Guard cells change shape (as light and humidity change), causing the stoma to open and close. lamina - the blade of a leaf.
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www.enchantedlearning.com/subjects/plants/leaf/
www.enchantedlearning.com/subjects/plants/leaf/
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The effect of cAMP on Ca(2+)-permeable channels from Arabidopsis thaliana leaf guard cell and mesophyll cell protoplasts was studied using the patch clamp technique. In the whole cell configuration, dibutyryl cAMP was found to increase a hyperpolarization-activated Ba(2+) conductance (I(Ba)).
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www.ncbi.nlm.nih.gov/pubmed/15199067
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On the basis of these parameters, guard-cell PEPC was distinguished from that of whole leaf, indicating either that guard cells contain a unique isoenzyme of PEPC or a different complement of isoenzymes or--and less likely--that the obligatorily different methodologies for the leaf (intact organ) and the guard...
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www.medscape.com/medline/abstract/8150661
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Guard cells are able to sense a multitude of environmental signals and appropriately adjust the stomatal pore to regulate gas exchange in and out of the leaf. ... Guard cells are able to sense a multitude of environmental signals and appropriately adjust the stomatal pore to regulate gas exchange in and out of the leaf.
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www.medscape.com/medline/abstract/11154346
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Plant cells are formed at meristems, and then develop into cell types which are grouped into tissues. Plants have only three tissue types: 1) Dermal; 2) Ground; and 3) Vascular. Dermal tissue covers the outer surface of ... Diagram of leaf structure. Note the arrangement of tissue layers within the leaf ... Guard Cells...
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www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookPLANT...
www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookPLANTANAT.html
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Plants with an increased guard cell Asc redox state were generated by increasing DHAR expression, and these exhibited a reduction in the level of guard cell H2O2. ... Regulation of tomato fruit ascorbate content is more highly dependent on fruit irradiance than leaf irradiance; Ann. Bot., February 1, 2009; 103(3):
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www.plantcell.org/cgi/content/abstract/16/5/1143
www.plantcell.org/cgi/content/abstract/16/5/1143
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Plants with an increased guard cell Asc redox state were generated by increasing DHAR expression, and these exhibited a reduction in the level of guard cell H2O2. ... Plants in which DHAR expression was increased exhibited an increase in the Asc redox state in the leaf as a whole, in the apoplast, and in guard cells,
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www.plantcell.org/cgi/content/full/16/5/1143
www.plantcell.org/cgi/content/full/16/5/1143
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