RT Journal Article
SR Electronic
T1 Aspects of Water Relations of the Grapevine (Vitis Vinifera)
JF American Journal of Enology and Viticulture
JO Am J Enol Vitic.
FD American Society for Enology and Viticulture
SP 84
OP 91
DO 10.5344/ajev.1974.25.2.84
VO 25
IS 2
A1 R. E. Smart
YR 1974
UL http://www.ajevonline.org/content/25/2/84.abstract
AB Diurnal patterns of leaf water potential (ψ) and stomatal resistance (rs) were investigated under different irrigation treatments and evaporative conditions. The ambient environment, especially solar radiation, had a dominating effect on leaf ψ. Water-stress-induced stomatal closure was observed at ψ of —13 bars, though shoot growth rate was inhibited before negative tensions became that large. Trunk diameter was very sensitive to water stress, even to hourly changes. Demonstrated as a simple yet effective indicator of water stress was the angle between the petiole and the lamina midrib.