"guard cell." A Dictionary of Biology. . Encyclopedia.com. (July 23, 2018). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/guard-cell-0
"guard cell." A Dictionary of Biology. . Retrieved July 23, 2018 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/guard-cell-0
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a. the effects of the overall water potential of the plant on the stomata;
b. a feedback mechanism, whereby when water is plentiful abscisic acid is formed and stomata open and when water is scarce abscisic acid is not released and the stomata close;
c. low carbon dioxide levels promote stomatal opening;
d. except in CAM plants, stomata normally open in light and close in darkness;
e. generally, an increase in temperature tends to increase stomatal opening.
"guard cell." A Dictionary of Plant Sciences. . Encyclopedia.com. (July 23, 2018). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/guard-cell
"guard cell." A Dictionary of Plant Sciences. . Retrieved July 23, 2018 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/guard-cell