MARTIN-STPAUL, Nicolas; DELZON, Sylvain; COCHARD, Hervé

doi:10.1111/ele.12851

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Licencia de uso del documento

http://creativecommons.org/licenses/by-sa/

MARTIN-STPAUL, Nicolas
Ecologie des Forêts Méditerranéennes [URFM]

DELZON, Sylvain
Biodiversité, Gènes & Communautés [BioGeCo]

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

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Article de revue

Este ítem está publicado en

Ecology Letters. 2017, vol. 20, n° 11, p. 1-11

Wiley

Resumen en inglés

Stomata play a significant role in the Earth’s water and carbon cycles, by regulating gaseousexchanges between the plant and the atmosphere. Under drought conditions, stomatal control oftranspiration has long been thought to be closely coordinated with the decrease in hydrauliccapacity (hydraulic failure due to xylem embolism). We tested this hypothesis by coupling a metaanalysisof functional traits related to the stomatal response to drought and embolism resistancewith simulations from a soil–plant hydraulic model. We report here a previously unreported phenomenon:the existence of an absolute limit by which stomata closure must occur to avoid rapiddeath in drought conditions. The water potential causing stomatal closure and the xylem pressureat the onset of embolism formation were equal for only a small number of species, and the differencebetween these two traits (i.e. safety margins) increased continuously with increasing embolismresistance. Our findings demonstrate the need to revise current views about the functional coordinationbetween stomata and hydraulic traits and provide a mechanistic framework for modelingplant mortality under drought conditions.< Leer menos

Palabras clave

résistance à la sécheresse

dynamique temporelle

résistance stomatique

aptitude à la conservation

plante résistante

modélisation hydraulique

méta analyse

trait fonctionnel

Palabras clave en inglés

Dieback

drought

stomata

tree mortality

xylem embolism

storage stability

metaanalysis

DOI

http://dx.doi.org/10.1111/ele.12851

Proyecto ANR

Plateforme d'Innovation " Forêt-Bois-Fibre-Biomasse du Futur " - ANR-10-EQPX-0016

Orígen

Importado de Hal

Centros de investigación

BioGeCo (Biodiversité Gènes & Communautés) - UMR 1202