Hydraulic plasticity and water use regulation act to maintain the hydraulic safety margins of Mediterranean trees in rainfall exclusion experiments.
cuticular conductance
evergreen and deciduous trees
hydraulic adjustment
hydraulic failure
phenotypic plasticity
stomatal control
throughfall exclusion
turgor
Journal
Plant, cell & environment
ISSN: 1365-3040
Titre abrégé: Plant Cell Environ
Pays: United States
ID NLM: 9309004
Informations de publication
Date de publication:
30 Jul 2024
30 Jul 2024
Historique:
revised:
14
06
2024
received:
31
01
2024
accepted:
17
07
2024
medline:
30
7
2024
pubmed:
30
7
2024
entrez:
30
7
2024
Statut:
aheadofprint
Résumé
Hydraulic failure due to xylem embolism has been identified as one of the main mechanisms involved in drought-induced forest decline. Trees vulnerability to hydraulic failure depends on their hydraulic safety margin (HSM). While it has been shown that HSM globally converges between tree species and biomes, there is still limited knowledge regarding how HSM can adjust locally to varying drought conditions within species. In this study, we relied on three long-term partial rainfall exclusion experiments to investigate the plasticity of hydraulic traits and HSM for three Mediterranean tree species (Quercus ilex L., Quercus pubescens Willd., and Pinus halepensis Mill.). For all species, a homeostasis of HSM in response to rainfall reduction was found, achieved through different mechanisms. For Q. ilex, the convergence in HSM is attributed to the adjustment of both the turgor loss point (Ψtlp) and the water potential at which 50% of xylem conductivity is lost due to embolism (P50). In contrast, the maintenance of HSM for P. halepensis and Q. pubescens is related to its isohydric behavior for the first and leaf area adjustment for the latter. It remains to be seen whether this HSM homeostasis can be generalized and if it will be sufficient to withstand extreme droughts expected in the Mediterranean region.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Subventions
Organisme : Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement
Organisme : Agence Nationale de la Recherche
Organisme : Agence de l'Environnement et de la Maîtrise de l'Energie
Organisme : José Castillejo mobility grant
Organisme : OSU OREME
Informations de copyright
© 2024 John Wiley & Sons Ltd.
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