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 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Wheeler, Dr. Keith |
Bildgröße: | 4394 px × 4394 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |