Abstract
SUMMARYThe effect of 2,4‐dinitrophenol (DNP) on stomatal movement in excised, turgid leaves of Stachytarpheta indica was investigated by microscopic examination of the abaxial epidermis. DNP prevented wide opening on illumination and closure in the dark, and affected concurrent changes in stomatal starch and potassium concentration in the guard cells. Carbon dioxide‐free air failed to reverse the DNP effect. The effect of DNP is attributed largely to its inhibition of hydrolysis of stomatal starch and of active transport of potassium ions to and from the guard cells. The possibility that DNP affects the energy supply for stomatal movements through its inhibition of oxidative phosphorylation is briefly discussed.
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