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Role of hydraulic and chemical signals in leaves, stems and roots in the stomatal behaviour of olive trees under water stress and recovery conditions

AutorTorres Ruiz, José Manuel ; Díaz-Espejo, Antonio ; Pérez Martín, Alfonso ; Hernández Santana, V.
Palabras claveABA
Hydraulic conductivity
Hydraulic segmentation
Lleaf hydraulic conductance
Stomatal conductance
Fecha de publicación4-abr-2015
EditorOxford University Press
CitaciónTree Physiology 35(4) 415-424 (2015)
ResumenThe control of plant transpiration by stomata under water stress and recovery conditions is of paramount importance for plant performance and survival. Although both chemical and hydraulic signals emitted within a plant are considered to play a major role in controlling stomatal dynamics, they have rarely been assessed together. The aims of this study were to evaluate (i) the dynamics of chemical and hydraulic signals at leaf, stem and root level, and (ii) their effect on the regulation of stomatal conductance (gs) during water stress and recovery. Measurements of gs, water potential, abscisic acid (ABA) content and loss of hydraulic functioning at leaf, stem and root level were conducted during a water stress and recovery period imposed on 1-year-old olive plants (Olea europaea L.). Results showed a strong hydraulic segmentation in olive plants, with higher hydraulic functioning losses in roots and leaves than in stems. The dynamics of hydraulic conductance of roots and leaves observed as water stress developed could explain both a protection of the hydraulic functionality of larger organs of the plant (i.e., branches, etc.) and a role in the down-regulation of gs. On the other hand, ABA also increased, showing a similar pattern to gs dynamics, and thus its effect on gs in response to water stress cannot be ruled out. However, neither hydraulic nor non-hydraulic factors were able to explain the delay in the full recovery of gs after soil water availability was restored.
Descripción10 páginas.-- 5 figuras.-- 1 tabla.--75referencias.-- This article appears in:Special Issue: Ninth International Workshop on Sap Flow
Versión del editorhttp://dx.doi.org/10.1093/treephys/tpu055
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