Yew Leaf Stomata (SEM)

Yew Leaf Stomata (SEM)

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Credit: POWER AND SYRED/SCIENCE PHOTO LIBRARY

Caption: Yew stomata. Coloured scanning electron micrograph (SEM) of stomata (pores) on the surface of the leaf of an English yew (Taxus baccata). Stomata are pores which regulate gas and water exchange between the leaf and the atmosphere. During the day they open (as seen here) to allow the exchange of gases during photosynthesis, closing at night to prevent water loss. They are opened and closed by two bordering guard cells. Yew is a long-lived poisonous tree which inhabits cool, hilly areas throughout Europe and northern Asia. Magnification x4260 (x1050 at 10cm wide).

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Keywords: conifer, english yew, european, evergreen, gaseous exchange, leaf, leaves, plant, plants, poisonous tree, scanning electron micrograph, scanning electron microscope, sem, softwood, stoma, stomata, taxus baccata, tree, water regulation, yew

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