Sunflower root, light micrograph

Sunflower root, light micrograph

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Credit: DR KEITH WHEELER/SCIENCE PHOTO LIBRARY

Caption: Sunflower root. Light micrograph of a transverse section through the root of a sunflower (Helianthus annuus) plant, showing primary tissue. From outer root to centre: single layer of cork cells (brown); cortex of parenchyma (blue); remains of the pericycle (blue). In the centre of the root, there is no pith, but the xylem, primary metaxylem and protoxylem make up the star-shaped arms (red). Next is a ring of outer primary phloem between the xylem (blue, small cells), with sieve tubes and plates (blue); layer of cambium (red). Magnification: x37 when printed 10 centimetres wide.

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Keywords: anatomical, anatomy, angiosperm, angiosperms, biological, biology, botanical, botany, cambium, cell, cells, cork, cortex, flora, helianthus annuus, histological, histology, light micrograph, microscope, nature, parenchyma, pericycle, phloem, plant, plants, plates, primary metaxylem, primary tissue, protoxylem, root, section, sectioned, sieve plate, sieve tube, structure, sunflower, tissue, tissues, tubes, vessel, vessels, white background, wildlife, xylem

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