Histological Compartmentation of Phosphate in Vicia faba L. Leaflet : Possible Significance to Stomatal Functioning.
Guard cells, epidermal cells, palisade parenchyma cells, and spongy parenchyma cells of Vicia faba L. leaflet were analyzed for inorganic phosphate and phosphorus. On a molar basis, cells in the epidermal layer contained about 15-fold more inorganic phosphate than mesophyll cells did. Although a metabolic role for this asymmetric distribution cannot be defined unequivocally, we note that high epidermal inorganic phosphate would buffer against pH changes in the epidermis during stomatal movements.
Outlaw
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Biology Unit 1, Florida State University, Tallahassee, Florida 32306.
Tarczynski
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Miller
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