Plant Stoma
by Dr Keith Wheeler/science Photo Library
Title
Plant Stoma
Artist
Dr Keith Wheeler/science Photo Library
Medium
Photograph - Photograph
Description
Plant stoma. Light micrograph of a stomatal pore (centre) on the surface of a stinging nettle (Urtica dioica) leaf. The stomata are gaps (white) within two guard cells (kidney-shaped). Stomata are pores that regulate the exchange of gases and water vapour into and out of the plant. The guard cells regulate this by expanding and deflating in response to osmotic pressure. When they expand, this causes them to move apart from one another and open the pore. This image was created using an epithelial peel to chemically remove the top layer of the leaf. Magnification: x230 when printed 10 centimetres tall.
Uploaded
October 26th, 2019
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