Summary
Daily leaf movements were compared with the intensities and proportions of red and far red light during sunrise and sunset. A linear relationship exists between the inverse of the 1/3 power of the minimum leaf movement against the elapsed time for its occurrence since either sunrise or sunset. A minimum of the ratio of the intensities of red to far red light at 6 min after sunrise and 16 min before sunset are suggested to be related to minimal levels of far red phytochrome and of ATP activity.
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Jonas, H. Responses of free running leaf movements to light, in particular to red and far red light during sunrise and sunset. Experientia 37, 571–573 (1981). https://doi.org/10.1007/BF01990055
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DOI: https://doi.org/10.1007/BF01990055