Leaf hydraulic conductance (KL) is higly dynamic and typically responds to water status and irradiance. However, the relative contribution of vascular (Kx) and extra-vascular (Kox) leaf water pathways to KL changes in response to water potential decline and recovery, as a function of light conditions, remains poorly investigated. We studied dynamic responses of leaf hydraulics in an evergreen (Arbutus unedo L.) and a deciduous (Populus nigra L.) tree species. We estimated the vulnerability of KL, Kx and Kox during dehydration, and the eventual recovery after re-watering leaves that experienced turgor loss. Measurements were performed at both low and high irradiance, and by using the vacuum chamber method (VCM) and the evaporative flux method (EFM). KL vulnerability was higher under high irradiance, as a result of marked changes in Kox. Moreover, KL recovery, as recorded in response to re-watering, was mostly due to Kox recovery in both species.

Dynamic changes of leaf hydraulic conductance in response to dehydratation and re-watering under low vs high irradiance

Trifilo P.
;
ABATE, ELISA;Lo Gullo M. A.;
2019

Abstract

Leaf hydraulic conductance (KL) is higly dynamic and typically responds to water status and irradiance. However, the relative contribution of vascular (Kx) and extra-vascular (Kox) leaf water pathways to KL changes in response to water potential decline and recovery, as a function of light conditions, remains poorly investigated. We studied dynamic responses of leaf hydraulics in an evergreen (Arbutus unedo L.) and a deciduous (Populus nigra L.) tree species. We estimated the vulnerability of KL, Kx and Kox during dehydration, and the eventual recovery after re-watering leaves that experienced turgor loss. Measurements were performed at both low and high irradiance, and by using the vacuum chamber method (VCM) and the evaporative flux method (EFM). KL vulnerability was higher under high irradiance, as a result of marked changes in Kox. Moreover, KL recovery, as recorded in response to re-watering, was mostly due to Kox recovery in both species.
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11570/3137559
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact