Volume 52 Number 4 Article 46
Year 1998 Month 10
Title: Concentrations of Amino Nitrogen and Soluble Carbohydrates in Bleeding Sap Collected at Bud Break of ´Cabernet Franc` and ´White Riesling` Grapevines Growing on Four Clonal Rootstocks
Authors: S.J. McArtney, D.C. Ferree, D.M. Scurlock and G.R. Johns
Abstract:
Concentrations of amino nitrogen and soluble carbohydrates were measured in bleeding sap collected at bud break from 'White Riesling' clone Niederhausen 378 and 'Cabernet Franc' grapevines
growing on either 33O9C, 101-l4Mgt, SO4 or 5BB rootstocks at Kingsville, OH. Amino nitrogen concentration was higher in sap collected from 'White Riesling' compared to the more vigorous 'Cabernet Franc' The concentration of soluble carbohydrates in bleeding sap was highest on 'Cabernet
Franc'/SO4 vines.
Differences in xylem solutes could not be related to cropping in the previous year
or to scion effects on vine vigor in the current year.
Rootstock did not influence vine vigor in the year
of this study.
Shoots on 'White Riesling' vines had less leaf area at bloom, and were more fruitful due
to the presence of clusters at more basal nodes on the shoot compared to 'Cabernet Franc'
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