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 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Shields, Martin |
Taille de l’image : | 3360 px × 5019 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : |
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