Peony stomata. Polarised light micrograph of a section through tissue from a peony (Paeonia sp.) plant, showing the stomata (round). Stomata are pores that open and close in order to regulate gas exchange in a plant. The aperture of each stoma is controlled by a pair of specialised cells known as guard cells (sausage-shaped). These cells swell to close the pore and shrink to open it. Stomata are found mainly on the underside of leaves. Magnification: x200 when printed 10 centimetres wide.

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TOP15882009

Source:

達志影像

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RM

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須由TPG 完整授權

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