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- W2885774413 abstract "The rhythmic movement of darkened Albizzia leaflets is accompanied by K+ flux in pulvinule motor cells whose turgor changes control opening and closing. The azide-sensitive open phase is promoted by an increase in temperature from 16 to 33 C (Qio = 3), implying active transport of K+ ions during this period. The azide-insensitive closed phase is less temperature-sensitive and has a Qio less than 1, implying diffusion or some other physical process as the predominant pathway of K+ flux at this time. Thus rhythmic leaflet movement is probably due to oscillation in active K+ transport or membrane permeability or both. External electrolytes (0. 1 N) alter leaflet angle during the open, but not the closed, phase of the rhythm. All chlorides except NH4' promote opening, with divalent more effective than monovalent ions. Some anions promote and others inhibit opening; activity is not correlated with charge. It is likely that electrolytes alter leaflet movement by altering Kt flux, accomplishing this by interacting with key macromolecules in motor cell membranes. Pfr phytochrome dampens the amplitude of rhythmic leaflet movement; this process is temperature sensitive (Qlo = 2) and unaltered by 0.1 N salt solutions. Although K+ flux is a common basis for phytochrome and rhythmic control of leaflet movement, different mechanisms are clearly involved." @default.
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- W2885774413 date "1973-01-01" @default.
- W2885774413 modified "2023-09-27" @default.
- W2885774413 title "Rhythmic Leaflet Movement in Albizzia julibrissin" @default.
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