RT Journal Article
SR Electronic
T1 Spatial Variability in Soil and Vine Water Status in Ontario Vineyards. Relationships to Yield and Berry Composition
JF American Journal of Enology and Viticulture
JO Am J Enol Vitic.
FD American Society for Enology and Viticulture
SP ajev.2019.19019
DO 10.5344/ajev.2019.19019
A1 Elena Kotsaki
A1 A.G. Reynolds
A1 Ralph Brown
A1 Hyun-Suk Lee
A1 Marilyne Jollineau
YR 2019
UL http://www.ajevonline.org/content/early/2019/12/10/ajev.2019.19019.abstract
AB Grapevine water status was evaluated in Ontario, Canada, on Vitis vinifera cvs. Riesling, Cabernet franc, and Pinot noir using leaf water potential (ψ) and surface soil water content (SSWC; %) to examine spatial relationships between soil and vine water status vs. berry composition variables, particularly secondary metabolites, and by doing so, assess their significance as drivers of the terroir effect. Research was conducted for two vintages (2014 and 2015). Strong inverse relationships were found between vine water status and total phenols in Cabernet franc and Pinot noir as well as monoterpenes in Riesling. Leaf ψ was associated with berry size, while yield exhibited strong negative correlations with pH and positive correlations with vine size (in most cases). Principal component analysis complemented with k-means clustering was useful in identifying relationships between variables, while Moran's I also indicated strong clustering patterns for SSWC. Both SSWC and leaf ψ showed weak correlations with each other. Overall, leaf ψ was a stronger indicator of important secondary metabolites (anthocyanins, phenols, color, and monoterpenes) than SSWC.