Sap from a grape vine (Vitis vinifera). Sap within woody plants is carried upwards in xylem elements of the central stem. Grape vines have a high root pressure so that if stems are cut in early spring before leaves develop,the sap bleeds profusely,as here | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Burgess, Dr. Jeremy |
Bildgröße: | 3421 px × 5125 px |
Modell-Rechte: | nicht erforderlich |
Restrictions: | - |