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Article Dans Une Revue Tree Physiology Année : 2015

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

Résumé

The 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 (g(s)) during water stress and recovery. Measurements of g(s), 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 g(s). On the other hand, ABA also increased, showing a similar pattern to g(s) dynamics, and thus its effect on g(s) 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 g(s) after soil water availability was restored.

Dates et versions

hal-01854613 , version 1 (06-08-2018)

Identifiants

Citer

Jose Manuel Torres Ruiz, Antonio Diaz-Espejo, Alfonso Perez-Martin, Virginia Hernandez-Santana. Role of hydraulic and chemical signals in leaves, stems and roots in the stomatal behaviour of olive trees under water stress and recovery conditions. Tree Physiology, 2015, 35 (4), pp.415-424. ⟨10.1093/treephys/tpu055⟩. ⟨hal-01854613⟩
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