CREEK, Danielle; LAMARQUE, Laurent; TORRES RUIZ, Jose Manuel; PARISE, Camille; BURLETT, Régis; TISSUE, David; DELZON, Sylvain

doi:10.1093/jxb/erz474

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CREEK, Danielle
Laboratoire de Physique et Physiologie Intégratives de l’Arbre en environnement Fluctuant [PIAF]

LAMARQUE, Laurent
Biodiversité, Gènes & Communautés [BioGeCo]

TORRES RUIZ, Jose Manuel
Laboratoire de Physique et Physiologie Intégratives de l’Arbre en environnement Fluctuant [PIAF]

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Ce document a été publié dans

Journal of Experimental Botany. 2020-01-23, vol. 71, n° 3, p. 1151-1159

Oxford University Press (OUP)

Résumé en anglais

Drought represents a major abiotic constraint to plant growth and survival. On the one hand, plants keep stomata open for efficient carbon assimilation while, on the other hand, they close them to prevent permanent hydraulic impairment from xylem embolism. The order of occurrence of these two processes (stomatal closure and the onset of leaf embolism) during plant dehydration has remained controversial, largely due to methodological limitations. However, the newly developed optical visualization method now allows concurrent monitoring of stomatal behaviour and leaf embolism formation in intact plants. We used this new approach directly by dehydrating intact saplings of three contrasting tree species and indirectly by conducting a literature survey across a greater range of plant taxa. Our results indicate that increasing water stress generates the onset of leaf embolism consistently after stomatal closure, and that the lag time between these processes (i.e. the safety margin) rises with increasing embolism resistance. This suggests that during water stress, embolism-mediated declines in leaf hydraulic conductivity are unlikely to act as a signal for stomatal down-regulation. Instead, these species converge towards a strategy of closing stomata early to prevent water loss and delay catastrophic xylem dysfunction.< Réduire

Mots clés en anglais

Drought

Embolism

Hydraulics

optical visualization

stomatal closure

water stress

xylem

DOI

http://dx.doi.org/10.1093/jxb/erz474

Project ANR

Plateforme d'Innovation " Forêt-Bois-Fibre-Biomasse du Futur " - ANR-10-EQPX-0016
Initiative d'excellence de l'Université de Bordeaux - ANR-10-IDEX-0003

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Importé de hal

Unités de recherche

BioGeCo (Biodiversité Gènes & Communautés) - UMR 1202