LM of the stem of a Jerusalem artichoke

LM of the stem of a Jerusalem artichoke

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Credit: RICHARD KIRBY, DAVID SPEARS LTD/ SCIENCE PHOTO LIBRARY

Caption: Light micrograph of a transverse section through the stem of a Jerusalem artichoke, Helianthus tuberosus, a close relative of the sunflower (Helianthus annuus). The large blue area, occupying the centre of the stem, is a region of medullary parenchyma tissue known as the pith. Surrounding this is a ring of pink vascular bundles. Each bundle is composed of three distinct regions: the innermost region (pink with finger- like projections) is xylem tissue, the dark central region is phloem tissue and the deep pink outer region is known as a pericyclic fibre. Magnification: x4 at 35mm size.

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Keywords: botany, helianthus tuberosus, jerusalem artichoke, light micrograph, nature, pith, plant, plants, stem, vascular bundle

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