Abstract
Isolated and purified guard cell protoplasts of starch-containing (Vicia faba) and starch-lacking (Allium cepa) stomata were used to study the metabolism of malate and Cl- anions as correlated with the K+-induced swelling of protoplasts. The correlation between swelling and malate synthesis in starch-containing and the inhibition of this correlation in starch-lacking guard cell protoplasts were demonstrated. A model system was proposed involving the role of malate and its place of synthesis in these two contrasting stomatal types.
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