Leaf vein xylem conduit diameter influences susceptibility to embolism and hydraulic decline

Autor: Andrew J. McElrone, Hervé Cochard, Shatara V. Townes, Caetano Pereira Pedroso de Albuquerque, Lawren Sack, Craig R. Brodersen, Christine Scoffoni, Thomas N. Buckley, Grace P. John
Přispěvatelé: University of California [Los Angeles] (UCLA), University of California, University of California [Davis] (UC Davis), Yale University [New Haven], Laboratoire de Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier (PIAF), Institut National de la Recherche Agronomique (INRA)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP), University of Sydney, University of California (UC)
Jazyk: angličtina
Rok vydání: 2016
Předmět:
0106 biological sciences
0301 basic medicine
Plant growth
percentage loss of conductivity
Physiology
Plant Biology & Botany
Plant Science
Leaf water
xylem collapse
Biology
xylem
01 natural sciences
Models
Biological
Petiole (botany)
Imaging
03 medical and health sciences
Electrical conduit
Imaging
Three-Dimensional
Species Specificity
cavitation
Models
Xylem
Botany
medicine
[SDV.BV]Life Sciences [q-bio]/Vegetal Biology
Computer Simulation
Water transport
microCT
Agricultural and Veterinary Sciences
Dehydration
xylème
fungi
Water
food and beverages
X-Ray Microtomography
Biological Sciences
medicine.disease
Biological
Plant Leaves
Horticulture
030104 developmental biology
venation architecture
collapse
Embolism
13. Climate action
Three-Dimensional
Transport system
010606 plant biology & botany
Zdroj: New Phytologist
New Phytologist, Wiley, 2016, 213 (3), 17 p. ⟨10.1111/nph.14256⟩
The New phytologist, vol 213, iss 3
New Phytologist, Wiley, 2016, 17 p. ⟨10.1111/nph.14256⟩
New Phytologist, 2016, 213 (3), 17 p. ⟨10.1111/nph.14256⟩
Scoffoni, C; Albuquerque, C; Brodersen, CR; Townes, SV; John, GP; Cochard, H; et al.(2017). Leaf vein xylem conduit diameter influences susceptibility to embolism and hydraulic decline. New Phytologist, 213(3), 1076-1092. doi: 10.1111/nph.14256. UC Davis: Retrieved from: http://www.escholarship.org/uc/item/0s69s6vj
ISSN: 0028-646X
1469-8137
DOI: 10.1111/nph.14256⟩
Popis: © 2016 The Authors. New Phytologist © 2016 New Phytologist Trust Ecosystems worldwide are facing increasingly severe and prolonged droughts during which hydraulic failure from drought-induced embolism can lead to organ or whole plant death. Understanding the determinants of xylem failure across species is especially critical in leaves, the engines of plant growth. If the vulnerability segmentation hypothesis holds within leaves, higher order veins that are most terminal in the plant hydraulic system should be more susceptible to embolism to protect the rest of the water transport system. Increased vulnerability in the higher order veins would also be consistent with these experiencing the greatest tensions in the plant xylem network. To test this hypothesis, we combined X-ray micro-computed tomography imaging, hydraulic experiments, cross-sectional anatomy and 3D physiological modelling to investigate how embolisms spread throughout petioles and vein orders during leaf dehydration in relation to conduit dimensions. Decline of leaf xylem hydraulic conductance (Kx) during dehydration was driven by embolism initiating in petioles and midribs across all species, and Kx vulnerability was strongly correlated with petiole and midrib conduit dimensions. Our simulations showed no significant impact of conduit collapse on Kx decline. We found xylem conduit dimensions play a major role in determining the susceptibility of the leaf water transport system during strong leaf dehydration.
Databáze: OpenAIRE
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