Negative allometry of leaf xylem conduit diameter and double-wall thickness: implications for implosion safety.
drought
implosion safety
leaf anatomy
plant allometry
plant hydraulics
xylem collapse
xylem conduit
Journal
The New phytologist
ISSN: 1469-8137
Titre abrégé: New Phytol
Pays: England
ID NLM: 9882884
Informations de publication
Date de publication:
19 Apr 2024
19 Apr 2024
Historique:
received:
11
12
2023
accepted:
25
03
2024
medline:
20
4
2024
pubmed:
20
4
2024
entrez:
19
4
2024
Statut:
aheadofprint
Résumé
Xylem conduits have lignified walls to resist crushing pressures. The thicker the double-wall (T) relative to its diameter (D), the greater the implosion safety. Having safer conduits may incur higher costs and reduced flow, while having less resistant xylem may lead to catastrophic collapse under drought. Although recent studies have shown that conduit implosion commonly occurs in leaves, little is known about how leaf xylem scales T vs D to trade off safety, flow efficiency, mechanical support, and cost. We measured T and D in > 7000 conduits of 122 species to investigate how T vs D scaling varies across clades, habitats, growth forms, leaf, and vein sizes. As conduits become wider, their double-cell walls become proportionally thinner, resulting in a negative allometry between T and D. That is, narrower conduits, which are usually subjected to more negative pressures, are proportionally safer than wider ones. Higher implosion safety (i.e. higher T/D ratios) was found in asterids, arid habitats, shrubs, small leaves, and minor veins. Despite the strong allometry, implosion safety does not clearly trade off with other measured leaf functions, suggesting that implosion safety at whole-leaf level cannot be easily predicted solely by individual conduits' anatomy.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Subventions
Organisme : Directorate for Biological Sciences
ID : DEB-2025282
Informations de copyright
© 2024 The Authors. New Phytologist © 2024 New Phytologist Foundation.
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