Title: Intervascular pit membranes with a torus in the wood of Ulmus (Ulmaceae) and related genera
Authors: Jansen, Steven ×
Choat, Brendan
Vinckier, Stefan
Lens, Frederic
Schols, Peter
Smets, Eric #
Issue Date: Jul-2004
Publisher: Wiley-Blackwell Publishing Ltd.
Series Title: New Phytologist vol:163 issue:1 pages:51-59
Abstract: The distribution of intervascular pit membranes with a torus was investigated in juvenile wood samples of 19 species of Ulmus and seven related genera. A staining solution of safranin and alcian blue (35 : 65) was recommended to
distinguish torus-bearing pit membranes using light microscopy. Intervascular pit membranes connecting relatively wide vessel elements resembled those of most angiosperms, as they were of uniform thickness. By contrast, bordered pit pairs with round to oval pit apertures and indistinct pit canals that connected narrow (incomplete) vessel elements or vascular tracheids with distinct helical thickenings were frequently characterized by a torus in ring-porous wood samples of
Ulmus and Zelkova. Tori were lacking in diffuse-porous species of Ampelocera, Aphananthe, Gironniera, Holoptelea, Phyllostylon, Trema and Ulmus. Our bservations suggest that tori are more common in cold temperate climates than in warm (sub)tropical environments. This may indicate that narrow tracheary elements with torus-bearing pit membranes provide an auxiliary conducting system which is
of low conductivity, but offers greater resistance to freezing-induced cavitation.
ISSN: 0028-646X
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Plant Systematics and Ecology Section - miscellaneous
Department of Biology - miscellaneous
× corresponding author
# (joint) last author

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