Indirect evidence for genetic differentiation in vulnerability to embolism in Pinus halepensis - Université Clermont Auvergne Accéder directement au contenu
Article Dans Une Revue Frontiers in Plant Science Année : 2016

Indirect evidence for genetic differentiation in vulnerability to embolism in Pinus halepensis

Résumé

Climate change is increasing mean temperatures and in the eastern Mediterranean is expected to decrease annual precipitation. The resulting increase in aridity may be too rapid for adaptation of tree species unless their gene pool already possesses variation in drought resistance. Vulnerability to embolism, estimated by the pressure inducing 50% loss of xylem hydraulic conductivity (P50), is strongly associated with drought stress resistance in trees. Yet, previous studies on various tree species reported low intraspecific genetic variation for this trait, and therefore limited adaptive capacities to increasing aridity. Here we quantified differences in hydraulic efficiency (xylem hydraulic conductance) and safety (resistance to embolism) in four contrasting provenances of Pinus halepensis (Aleppo pine) in a provenance trial, which is indirect evidence for genetic differences. Results obtained with three techniques (bench dehydration, centrifugation and X-ray micro-CT) evidenced significant differentiation with similar ranking between provenances. Inter-provenance variation in P50 correlated with pit anatomical properties (torus overlap and pit aperture size). These results suggest that adaptation of P. halepensis to xeric habitats has been accompanied by modifications of bordered pit function driven by variation in pit aperture. This study thus provides evidence that appropriate exploitation of provenance differences will allow continued forestry with P. halepensis in future climates of the Eastern Mediterranean.
Fichier principal
Vignette du fichier
2016_DavidSchwartz_Frontiers_Plant_Sci_{935869D6-86E6-469F-B196-E1C7F295F277}.pdf (1.07 Mo) Télécharger le fichier
Origine : Accord explicite pour ce dépôt
Loading...

Dates et versions

hal-01512018 , version 1 (21-04-2017)

Licence

Paternité

Identifiants

Citer

Rakefet David-Schwartz, Indira Paudel, Maayan Mizrachi, Sylvain Delzon, Hervé H. Cochard, et al.. Indirect evidence for genetic differentiation in vulnerability to embolism in Pinus halepensis. Frontiers in Plant Science, 2016, 7, 13 p. ⟨10.3389/fpls.2016.00768⟩. ⟨hal-01512018⟩
119 Consultations
67 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More