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guard cell

   Also found in: Dictionary/thesaurus, Medical, Wikipedia 0.01 sec.
guard cell [′gärd ‚sel]
(botany)
Either of two specialized cells surrounding each stoma in the epidermis of plants; functions in regulating stoma size.


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Miller-Rushing and colleagues found that stomatal density declined while guard cell length increased in oaks and hornbeams, although these changes were not dependent on the magnitude of changes in CO2 concentrations.
In berry research particularly, anthocyanins have been shown to possess strong antioxidant qualities that guard cells of the fruit pulp and seeds from reactive oxygen species ("free radicals") formed during normal plant metabolism and exposure to ultraviolet light.
They are also now under investigation for their unique ability to stop LDL cholesterol, reduce blood clotting, and even guard cells against harmful carcinogens.
 
 
 
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