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guard cell

   Also found in: Medical, Encyclopedia, Wikipedia, Hutchinson 0.04 sec.
guard cell
n.
One of the paired epidermal cells that control the opening and closing of a stoma in plant tissue.
guard cell  (gärd)
One of the paired cells in the epidermis of a plant that control the opening and closing of a stoma of a leaf. When swollen with water, guard cells pull apart from each other, opening the stoma to allow the escape of water vapor and the exchange of gases. When drier, guard cells become more flaccid and move closer together, allowing the plant to conserve water. Unlike the other cells in the epidermis, guard cells have chloroplasts and conduct photosynthesis. See more at stoma.
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Zeiger and his co-workers now have isolated guard cell chloroplasts and report that they convert light into a cellular fuel, ATP, as do the functional chloroplasts elsewhere in the plants.
Plant 'sight' from pores and pumps by Miller, Julie Ann / Science News
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