Plant sleep movements sequence #1

Plant sleep movements sequence #1

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Credit: MARTIN SHIELDS/SCIENCE PHOTO LIBRARY

Caption: Common bean (Phaseolus vulgaris) seedling at 12:00 noon. The leaves are oriented in the horizontal plane to maximize photosynthesis. In the next photo in the sequence (10:00 p.m.) the leaves have moved to a sleeping vertical position (even though lights are on). These movements are governed by an internal circadian clock (circadian rhythm) that stimulates variations in turgor pressure between day and nighttime.

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Keywords: angiosperm, bean, bean plant, circadian, circadian clock, common bean, cotyledons, cycle, dicot, dicots, dicotyledon, dicotyledons, flowering plant, green, internal, kidney, legume, nature, phaseolus, phaseolus vulgaris, plant, rhythm, science, seedling, sequence, sleep movement, sleep movements, turgor movement, turgor pressure

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