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 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Wheeler, Dr. Keith |
Bildgröße: | 5889 px × 2973 px |
Modell-Rechte: | nicht erforderlich |
Restrictions: | - |