JOHNSON, Daniel; KATUL, Gabriel; DOMEC, Jean‐christophe

doi:10.1111/pce.14327

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Licence d’utilisation du document

http://creativecommons.org/licenses/by-nc-nd/

JOHNSON, Daniel
University of Georgia [USA]

KATUL, Gabriel
Department of Civil and Environmental Engineering [Durham] [CEE]
Duke University [Durham]

DOMEC, Jean‐christophe
Interactions Sol Plante Atmosphère [UMR ISPA]
Duke University [Durham]

Langue

Article de revue

Ce document a été publié dans

Plant, Cell and Environment. 2022-05-27, vol. 45, n° 8, p. 2231 - 2266

Wiley

Résumé en anglais

Water inside plants forms a continuous chain from water in soils to the water evaporating from leaf surfaces. Failures in this chain result in reduced transpiration and photosynthesis and are caused by soil drying and/or cavitation-induced xylem embolism. Xylem embolism and plant hydraulic failure share several analogies to ‘catastrophe theory’ in dynamical systems. These catastrophes are often represented in the physiological and ecological literature as tipping points when control variables exogenous (e.g., soil water potential) or endogenous (e.g., leaf water potential) to the plant are allowed to vary on time scales much longer than time scales associated with cavitation events. Here, plant hydraulics viewed from the perspective of catastrophes at multiple spatial scales is considered with attention to bubble expansion within a xylem conduit, organ-scale vulnerability to embolism, and whole-plant biomass as a proxy for transpiration and hydraulic function. The hydraulic safety-efficiency tradeoff, hydraulic segmentation and maximum plant transpiration are examined using this framework. Underlying mechanisms for hydraulic failure at fine scales such as pit membranes and cell-wall mechanics, intermediate scales such as xylem network properties and at larger scales such as soil–tree hydraulic pathways are discussed. Understudied areas in plant hydraulics are also flagged where progress is urgently needed.< Réduire

URI

https://oskar-bordeaux.fr/handle/20.500.12278/195152

DOI

http://dx.doi.org/10.1111/pce.14327

Project ANR

Le fonctionnement hydraulique des plantes face au changement climatique - ANR-21-CE02-0033

Origine

Importé de hal

Unités de recherche

Interactions Soil Plant Atmosphere (ISPA) - UMR 1391