Potassium flux into and out of pulvinal motor cells is the basis for the turgor changes leading to leaflet movement in Albizzia and other nyctinastic plants. Endogenous rhythm, phytochrome and a blue absorbing pigment interact to control this movement, apparently by regulating potassium pumps and diffusion channels in motor cell membranes.
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Satter et al. (1973) studied this question.
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