Shoot Growth and Anthesis in Vitis by Charlotte Pratt and B.G. Coombe
In the majority of shoots on a grapevine the number of internodes is fairly constant at anthesis. The number of visible internodes was higher in Vitis vinifera L. (16-19) then in V. labruscana BAILEY (12-14). This synchrony in the rates of development of nodes at the shoot tip and of the flowers on the inflorescence was found in a wide array of conditions (time, cultivars, countries, climates, cultural practices). The factor found to cause the greatest variation between vines was vine vigour.