Rapid Changes in Abscisic Acid‐like Inhibitors Following Alterations in Vine Leaf Water Potential

This is the authors' abstract. We don't add key points for this paper.

Endogenous levels of abscisic acid‐like inhibitors doubled within 15 minutes of leaf excision in Vitis vinifera under laboratory conditions. At that stage water potential Ψ had fallen to ‐15 bars and stomatal closure was occurring. After prolonged stress (6 days and final Ψ ‐13 bars) inhibitor levels in intact vine leaves increased by a factor of 44 but showed a rapid decline following rewatering. Photosynthetic activity was not immediately restored, and its gradual recovery was not directly related to inhibitor level.