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Canadian Pondweed Leaf, Light Micrograph
Dr Keith Wheeler
Photograph - Photograph
Canadian pondweed leaf. Light micrograph of a section through a leaf from a Canadian pondweed (Elodea canadiensis) plant. The centre of the stem has a vascular system (blue) made up of a primitive axial strand that consists of the fusion of several vascular bundles but lacks xylem vessels. It doesn’t need a strong vascular tissue because the water-pressure supports the stem and the epidermis is permeable to water and mineral salts. The cortex (outer layer) is made up aerenchyma tissue (red) with wide inter-cellar spaces for buoyancy and storing gases e.g. oxygen. The cells within the cortex are full of chloroplasts (red). Magnification x37 when printed 10 centimetres wide.
May 2nd, 2013
Viewed 18 Times - Last Visitor from Sweden on 10/30/2014 at 9:12 AM
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