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Nodes

nodes (GB)

Latin term for the knots (ez. nodium, German: Knoten) on the shoots of the vine. Each shoot is divided into the somewhat thickened nodes and the internodes (shoot axes) between them. The medullary canal runs through each internode, which in all varieties of the vine subgenus Vitis is interrupted at each node (nodium) by the diaphragm (tissue plate = septum). This division into shoot members increases the static strength of the long shoot. In addition, the leaves, tendrils, shoots and eyes (buds) emerge from the nodes. The length and thickness of the shoot members depend on the grape variety, the growing conditions and nutrient supply as well as the position on the shoot. At the top of growing shoots, the nodes are naturally still close together until the process of internode length growth by cell stretching and cell division is completed and the shoot section is lignified.

Trieb (Zeichnung)

At the end of the vegetative cycle, the newly branched internodes become thinner and shorter as the growth processes slow down. In case of nutrient deficiency and water stress, the internodes are only short due to the generally slowed metabolism. The length of the internodes ranges from 1 to 35 centimetres. Short internodes have Gewürztraminer, Grüner Veltliner, Muskat-Ottonel, Pinot Blanc, Pinot Gris, Pinot Noir, Silvaner, St. Laurent, Welschriesling and Zweigelt, long internodes have Blauer Portugieser, BlaufränkischChasselas, Early red VeltlinerMüller-Thurgau, Neuburger and Riesling.

Auge (Knospe) an Nodium - Zeichnung und Foto
all pictures taken from Bauer/Regner/Schildberger,
Viticulture, ISBN: 978-3-70402284-4, Cadmos Verlag GmbH

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