Stoma of a pea leaf

Stoma of a pea leaf

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Caption: False-colour transmission electron micrograph of a stomatal complex in a young leaf of the pea plant, Pisum sativum. The picture shows two developing guard cells separated by a cell wall which will split to form the stomatal opening. Both cells are dominated by a large nucleus containing clumps of chromatin (red). Stomata are pores in the epidermis of the leaf; they regulate the exchange of water & gases between the atmosphere & the leaf interior. When the guard cells are full of water the pore is open; when it loses water the pore closes. Closure is a natural response to darkness & drought. Magnification: x1500 at 35mm size, x2600 at 6x4.5cm size. Reference: MICROCOSMOS, figure 4.11, page 73.

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Keywords: botany, false-coloured, guard cell, leaf, leaves, nature, pea, pisum sativum, plant, plants, stoma, tem

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