Stomata on a rose leaf. Polarised light micrograph of the lower leaf surface of a Garden Rose Rosa sp.,showing stomata. Variously shaped epidermal cells cover the leaf surface. At left are elongated cells which form a branching leaf vein. Scattered on the epidermis are stomata (singular: stoma),tiny pores each of which is bordered by two kidney-shaped guard cells. Guard cells serve to open and close the stoma: opening the pore allows gases to be exchanged by leaf tissues during photosynthesis; and closing the pore at night or during dry periods prevents water loss. In the rose,more stomata occur on the underside of leaves. Magnification: x108 at 6x4.5cm size. Magnification: x63 at 35mm size | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Power And Syred |
Taille de l’image : | 3510 px × 2580 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |