SEM of open stoma on tobacco leaf

SEM of open stoma on tobacco leaf

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Credit: DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY

Caption: False colour scanning electron micrograph of an open stoma on the surface of a tobacco leaf Nicotiana tabacum. Stomata are breathing pores scattered over the leaf surface, and sometimes stem, that regulate the exchange of gases between the leaf's interior and the atmosphere. Stomatal closure is a natural response to darkness or drought as a means of conserving water. Each pore is controlled by the turgor of two guard cells on either side; when the guard cells are full of water the pore is open; when they lose turgor, the pore closes. The flecks on the pore are salts from dried water vapour; around it are epidermal cells. Magnification: X 343 at 35mm size. Original is BW print b745/171

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Keywords: botany, epidermis, leaf, leaf surface, leaves, nature, nicotiana tabacum, open, open stoma, plant, plants, scanning electron micrograph, sem, stoma, stomata

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