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Article Dans Une Revue Plant, Cell and Environment Année : 2009

Capacitive effect of cavitation in xylem conduits: results from a dynamic model

Résumé

Embolisms decrease plant hydraulic conductance and therefore reduce the ability of the xylem to transport water to leaves provided that embolized conduits are not refilled. However, as a xylem conduit is filled with gas during cavitation, water is freed to the transpiration stream and this transiently increases xylem water potential. This capacitive effect of embolism formation on plant function has not been explicitly quantified in the past. A dynamic model is presented that models xylem water potential, xylem sap flow and cavitation, taking into account both the decreasing hydraulic conductance and the water release effect of xylem embolism. The significance of the capacitive effect increases in relation to the decreasing hydraulic conductance effect when transpiration rate is low in relation to the total amount of water in xylem conduits. This ratio is typically large in large trees and during drought.

Dates et versions

hal-01189354 , version 1 (01-09-2015)

Identifiants

Citer

Teemu Holtta, Hervé Cochard, Eero Nikinmaa, Maurizio Mencuccini. Capacitive effect of cavitation in xylem conduits: results from a dynamic model. Plant, Cell and Environment, 2009, 32 (1), pp.10-21. ⟨10.1111/j.1365-3040.2008.01894.x⟩. ⟨hal-01189354⟩
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