<?xml version='1.0' encoding='UTF-8'?><xml><records><record><source-app name="HighWire" version="7.x">Drupal-HighWire</source-app><ref-type name="Journal Article">17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Smart, R. E.</style></author></authors><secondary-authors></secondary-authors></contributors><titles><title><style face="normal" font="default" size="100%">Aspects of Water Relations of the Grapevine (Vitis Vinifera)</style></title><secondary-title><style face="normal" font="default" size="100%">American Journal of Enology and Viticulture</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">1974</style></year><pub-dates><date><style  face="normal" font="default" size="100%">1974-01-01 00:00:00</style></date></pub-dates></dates><pages><style  face="normal" font="default" size="100%">84-91</style></pages><doi><style  face="normal" font="default" size="100%">10.5344/ajev.1974.25.2.84</style></doi><volume><style face="normal" font="default" size="100%">25</style></volume><issue><style face="normal" font="default" size="100%">2</style></issue><abstract><style  face="normal" font="default" size="100%">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.</style></abstract></record></records></xml>