Sunflower root, light micrograph

Sunflower root, light micrograph

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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 violet); cortex of parenchyma (violet); ring and remains of the pericycle (dark violet). At the centre of the root there is no pith, but xylem primary metaxylem (centre) and protoxylem, made up of star-shaped arms (grey); next is the primary phloem, in-between the xylem, with small cells (dark-violet) and sieve tubes. Magnification: x13 when printed 10 centimetres wide.

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

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