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Pré-Publication, Document De Travail (Preprint/Prepublication) Peer Community In Forest & Wood Sciences Année : 2020

A new mechanism for tree mortality due to drought and heatwaves

Résumé

Plants tend to die earlier in hot and drought conditions, but the underlying mechanisms are not yet understood. I propose here a new mechanism by which excessive residual water losses caused by high cuticular permeabilities and a high leaf-to-air vapor pressure deficits would trigger uncontrolled and sudden cavitation events. The combination of heat and drought stresses may therefore lead to an unsuspected risk of hydraulic failure. I explored this hypothesis with a new mechanistic model. The simulations support this hypothesis and highlight the critical role played by the cuticle phase transition temperature. Experiments are now awaited to confirm these predictions.
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Dates et versions

hal-03203086 , version 1 (28-08-2019)
hal-03203086 , version 2 (20-04-2021)

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Paternité - Pas d'utilisation commerciale - Pas de modification

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Hervé Cochard. A new mechanism for tree mortality due to drought and heatwaves. 2020. ⟨hal-03203086v2⟩
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