Sunflower stem, light micrograph

Sunflower stem, light micrograph

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Credit: DR KEITH WHEELER/SCIENCE PHOTO LIBRARY

Caption: Sunflower stem. Light micrograph of a section through a young stem from a sunflower (Helianthus annuus), showing the tissues within one of the many vascular bundles. From left to right: collenchyma tissue (yellow and violet) for flexible support; cortex of parenchyma tissue (red and blue); long thick-walled supportive cells (yellow and green); long thin-walled cells of the phloem sieve tubes; companion cells (red and blue); xylem vessels: annual, spiral, and pitted vessels that carry water and minerals to the stem (yellow and light blue); and lastly the pith, composed of parenchyma tissue (deep blue). Magnification: x37, when printed 10 centimetres wide.

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Keywords: angiosperm, angiosperms, biological, biology, botanical, botany, bundles, cell, cell biology, cells, close-up, collenchyma tissue, companion cells, cortex, cytological, cytology, detail, dicot, dicots, dicotyledon, dicotyledons, helianthus annuus, histological, histology, light micrograph, light microscope, microscopy, parenchyma, phloem, pith, plant, plants, section, sectioned, sieve tube, stain, stained, stem, structural, structure, structures, sunflower, support, supportive cells, thick-walled, thin-walled, tissue, tubes, vascular bundle, vessels, xylem vessel, young

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