Direct observation and modelling of embolism spread between xylem conduits: a case study in Scots pine
COCHARD, Hervé
Laboratoire de Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier [PIAF]
Laboratoire de Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier [PIAF]
MENCUCCINI, Maurizio
The University of Edinburgh
Institució Catalana de Recerca i Estudis Avançats = Catalan Institution for Research and Advanced Studies [ICREA]
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The University of Edinburgh
Institució Catalana de Recerca i Estudis Avançats = Catalan Institution for Research and Advanced Studies [ICREA]
COCHARD, Hervé
Laboratoire de Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier [PIAF]
Laboratoire de Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier [PIAF]
MENCUCCINI, Maurizio
The University of Edinburgh
Institució Catalana de Recerca i Estudis Avançats = Catalan Institution for Research and Advanced Studies [ICREA]
The University of Edinburgh
Institució Catalana de Recerca i Estudis Avançats = Catalan Institution for Research and Advanced Studies [ICREA]
BADEL, Eric
Laboratoire de Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier [PIAF]
< Reduce
Laboratoire de Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier [PIAF]
Language
en
Article de revue
This item was published in
Plant, Cell and Environment. 2016, vol. 39, n° 12, p. 2774-2785
Wiley
English Abstract
Xylem embolism is one of the main processes involved in drought-related plant mortality. Although its consequences for plant physiology are already well described, embolism formation and spread are poorly evaluated and ...Read more >
Xylem embolism is one of the main processes involved in drought-related plant mortality. Although its consequences for plant physiology are already well described, embolism formation and spread are poorly evaluated and modelled, especially for tracheid-based species. The aim of this study was to assess the embolism formation and spread in Pinus sylvestris as a case study using X-ray microtomography and hydraulics methods. We also evaluated the potential effects of cavitation fatigue on vulnerability to embolism and the micro-morphology of the bordered pits using scanning electron microscopy (SEM) to test for possible links between xylem anatomy and embolism spread. Finally, a novel model was developed to simulate the spread of embolism in a 2D anisotropic cellular structure. Results showed a large variability in the formation and spread of embolism within a ring despite no differences being observed in intertracheid pit membrane anatomical traits. Simulations from the model showed a highly anisotropic tracheid-to-tracheid embolism spreading pattern, which confirms the major role of tracheid-to-tracheid air seeding to explain how embolism spreads in Scots pine. The results also showed that prior embolism removal from the samples reduced the resistance to embolism of the xylem and could result in overestimates of vulnerability to embolism.Read less <
Keywords
cavitation
fatigue
vulnérabilité
embolisme
microtomographie
anatomie du xylème
English Keywords
vulnerability to embolism
xylem anatomy
x-ray microtomography
drought-induced embolism
stress-induced
vulnerability segmentation
hydraulic conductance
resistance
recovery
mechanism
conifers
curves
vulnerability
Origin
Hal imported