Are needles of Pinus pinaster more vulnerable to xylem embolism than branches? New insights from X-ray computed tomography
BOUCHE, Pauline S.
Biodiversité, Gènes & Communautés [BioGeCo]
Institute for Systematic Botany and Ecology
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Biodiversité, Gènes & Communautés [BioGeCo]
Institute for Systematic Botany and Ecology
BOUCHE, Pauline S.
Biodiversité, Gènes & Communautés [BioGeCo]
Institute for Systematic Botany and Ecology
Biodiversité, Gènes & Communautés [BioGeCo]
Institute for Systematic Botany and Ecology
BADEL, Eric
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]
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]
CHARRA-VASKOU, Katline
Laboratoire de Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier [PIAF]
< Leer menos
Laboratoire de Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier [PIAF]
Idioma
en
Article de revue
Este ítem está publicado en
Plant, Cell and Environment. 2016, vol. 39, n° 4, p. 860–870
Wiley
Resumen en inglés
Plants can be highly segmented organisms with an independently redundant design of organs. In the context of plant hydraulics, leaves may be less embolism resistant than stems, allowing hydraulic failure to be restricted ...Leer más >
Plants can be highly segmented organisms with an independently redundant design of organs. In the context of plant hydraulics, leaves may be less embolism resistant than stems, allowing hydraulic failure to be restricted to distal organs that can be readily replaced. We quantified drought-induced embolism in needles and stems of Pinus pinaster using high-resolution computed tomography (HRCT). HRCT observations of needles were compared with the rehydration kinetics method to estimate the contribution of extra-xylary pathways to declining hydraulic conductance. High-resolution computed tomography images indicated that the pressure inducing 50% of embolized tracheids was similar between needle and stem xylem (P50 needle xylem = −3.62 MPa, P50 stem xylem = −3.88 MPa). Tracheids in both organs showed no difference in torus overlap of bordered pits. However, estimations of the pressure inducing 50% loss of hydraulic conductance at the whole needle level by the rehydration kinetics method were significantly higher (P50 needle = −1.71 MPa) than P50 needle xylem derived from HRCT. The vulnerability segmentation hypothesis appears to be valid only when considering hydraulic failure at the entire needle level, including extra-xylary pathways. Our findings suggest that native embolism in needles is limited and highlight the importance of imaging techniques for vulnerability curves.< Leer menos
Palabras clave
hydraulic failures
Palabras clave en inglés
conifer
embolised tracheids
wall deformation
direct visualization of water content
Proyecto europeo
International Mobility Programme to Strengthen Skills and Excellence in Research for Agriculture
Orígen
Importado de HalCentros de investigación