The rapid nyctinastic movements of Albizzia julibrissin pinnules are under the control of phytochrome. When given prior to a dark period, red light facilitates and far-red light inhibits pinnule closure in the dark. These light effects are mutually photoreversible. The opening reaction of the pinnules following a dark period is mediated mainly by blue light. The nyctinastic closure response is accompanied by an increased rate of electrolyte efflux from the cut pinna base. This observation, coupled with the fact that the rapid nyctinastic movement is not affected by actinomycin D, supports the view that phytochrome control of the sleep movement is not mediated through effects on RNA metabolism, but rather through changes in membrane permeability.
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Jaffe, M.J., Galston, A.W. Phytochrome control of rapid nyctinastic movements and membrane permeability in Albizzia julibrissin . Planta 77, 135–141 (1967). https://doi.org/10.1007/BF00387450
- Membrane Permeability
- Blue Light
- Dark Period