MRAD, Assaad; DOMEC, Jean-Christophe; HUANG, Cheng-Wei; LENS, Frederic; KATUL, Gabriel

doi:10.1111/pce.13415

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MRAD, Assaad
Nicholas School of the Environment

DOMEC, Jean-Christophe
Interactions Sol Plante Atmosphère [UMR ISPA]
Nicholas School of the Environment

HUANG, Cheng-Wei
Department of Biology [New Mexico]

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Plant, Cell and Environment. 2018, vol. 41, n° 12, p. 2718-2730

Wiley

Résumé en anglais

Plant xylem response to drought is routinely represented by a vulnerability curve (VC). Despite the significance of VCs, the connection between anatomy and tissue-level hydraulic response to drought remains a subject of inquiry. We present a numerical model of water flow in flowering plant xylem that combines current knowledge on diffuse-porous anatomy and embolism spread to explore this connection. The model produces xylem networks and uses different parameterizations of intervessel connection vulnerability to embolism spread: the Young-Laplace equation and pit membrane stretching. Its purpose is upscaling processes occurring on the microscopic length scales, such as embolism propagation through pit membranes, to obtain tissue-scale hydraulics. The terminal branch VC of Acer glabrum was successfully reproduced relying only on real observations of xylem tissue anatomy. A sensitivity analysis shows that hydraulic performance and VC shape and location along the water tension axis are heavily dependent on anatomy. The main result is that the linkage between pit-scale and vessel-scale anatomical characters, along with xylem network topology, affects VCs significantly. This work underscores the importance of stepping up research related to the three-dimensional network structure of xylem tissues. The proposed model's versatility makes it an important tool to explore similar future questions.< Réduire

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Acer

hydraulics

model

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anatomy

cavitation

network

vulnerability curve

wood

xylem

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A network model links wood anatomy to xylem tissue hydraulic behaviour and vulnerability to cavitation

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