Common bean (Phaseolus vulgaris) seedling 'sleeping' at 10:00 p.m.. The leaves are oriented in the vertical plane to reduce transpiration. In the previous photo in the sequence (noon) the leaves had moved to a horizontal position to photosynthesize. These movements are governed by an internal circadian clock (circadian rhythm) that stimulates variations in turgor pressure between day and nighttime | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Shields, Martin |
Bildgröße: | 3360 px × 5019 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: |
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