Whole-plant hydraulic conductance and root-to-shoot flow of abscisic acid are independently affected by water stress in grapevines

• DOI: 10.1071/fp02079
• Publication Date: 2003-03-06T22:38:16Z
• Authors: Claudio Lovisolo; Wolfram Hartung; Andrea Schubert
• Keywords: Stomatal Conductance; Drought stress

In order to investigate whether plant hydraulic conductance (gplant) is reduced under drought conditions via an ABA-related mechanism, a water-stress experiment was carried out using split-rooted grapevines. addition, inversion of shoot growth orientation imposed reduce gplant independently soil water availability, and thus the putative ABA root-generated stress message. As expected, on split-roots affected accumulation. drought-stress message negatively stomatal (gs) transpiration (E), but modified neither leaf or stem potentials (Ψleaf Ψstem, respectively), nor gplant. When in split-rooted, shoot-inverted (s-r/s-i) grapevines, Ψleaf Ψstem decreased, without changes accumulation, gs E. The did not modify gplant, (impaired by shoot-growth inversion) decrease delivery leaves. However, depressed s-r/s-i fact that no interaction between messages (caused split-root technique) constraints sap flow necessary impair suggests targets hydraulic-limitation effects expansion are same.