Canadian pondweed leaf, light micrograph

Canadian pondweed leaf, light micrograph

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Credit: DR KEITH WHEELER/SCIENCE PHOTO LIBRARY

Caption: 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: x70 when printed 10 centimetres wide.

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Keywords: aerenchyma, angiosperm, angiosperms, aquatic, axial strand, biological, biology, black background, blue background, botanical, botany, bundles, canadian pondweed, cell, cell biology, cells, chloroplast, chloroplasts, close-up, cortex, cut out, cut outs, cut-out, cut-outs, cutout, cutouts, cytological, cytology, detail, elodea canadiensis, epidermis, fused, histological, histology, light micrograph, light microscope, microscopy, monocot, monocots, monocotyledon, monocotyledons, plant, plants, pond weed, pond-weed, primitive vascular system, section, sectioned, stain, stained, structural, structure, structures, tissue, vascular bundle, water permeable

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