Aspects of Water Relations of the Grapevine (Vitis Vinifera)
- 1 January 1974
- journal article
- Published by American Society for Enology and Viticulture in American Journal of Enology and Viticulture
- Vol. 25 (2) , 84-91
- https://doi.org/10.5344/ajev.1974.25.2.84
Abstract
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.Keywords
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