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Intervascular Pitting in Fraxinus Americana L.

Intervascular Pitting in Fraxinus Americana L. IAWA Bulletin n.s., Vol. 2 (4),1981 169 by E.A. Wheeler Department of Wood and Paper Science, North Carolina State University, Raleigh, North Carolina 27650, U.S.A. Summary There is seasonal variation in the appearance in the enzyme activity in ray cells in the sap­ of intervascular pit membranes in Fraxinus wood (e.g. Sauter et aI., 1973) of temperate­ americana L. (white ash). Intervascular pit zone angiosperms are known, but this is the membranes in the newly-formed wood resem­ first report of seasonal differences in features ble those observed in the sapwood of other of the tracheary elements in wood. angiosperm species, i.e. microfibrils are distinct and randomly arranged. Observation of the two Materials and Methods outer sapwood rings show they retain this ap­ Wood samples were obtained from two ma­ pearance in the summer. In the fall, micro­ ture trees of white ash (Fraxinus americana L.) fibrils are still discernible, but the membranes cut during the winter. Initial observations of appear to be slightly in filled with extraneous the sapwood from these winter-felled trees re­ materials. During the winter, there is a coating vealed that the microfibrils of the intervascular on the membranes which permeates them, pit membranes were completely http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png IAWA Journal Brill

Intervascular Pitting in Fraxinus Americana L.

IAWA Journal, Editors
IAWA Journal , Volume 2 (4): 6 – Jan 1, 1981
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Publisher
Brill
Copyright
Copyright © Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0928-1541
eISSN
2294-1932
DOI
10.1163/22941932-90000726
Publisher site
See Article on Publisher Site

Abstract

IAWA Bulletin n.s., Vol. 2 (4),1981 169 by E.A. Wheeler Department of Wood and Paper Science, North Carolina State University, Raleigh, North Carolina 27650, U.S.A. Summary There is seasonal variation in the appearance in the enzyme activity in ray cells in the sap­ of intervascular pit membranes in Fraxinus wood (e.g. Sauter et aI., 1973) of temperate­ americana L. (white ash). Intervascular pit zone angiosperms are known, but this is the membranes in the newly-formed wood resem­ first report of seasonal differences in features ble those observed in the sapwood of other of the tracheary elements in wood. angiosperm species, i.e. microfibrils are distinct and randomly arranged. Observation of the two Materials and Methods outer sapwood rings show they retain this ap­ Wood samples were obtained from two ma­ pearance in the summer. In the fall, micro­ ture trees of white ash (Fraxinus americana L.) fibrils are still discernible, but the membranes cut during the winter. Initial observations of appear to be slightly in filled with extraneous the sapwood from these winter-felled trees re­ materials. During the winter, there is a coating vealed that the microfibrils of the intervascular on the membranes which permeates them, pit membranes were completely

Journal

IAWA Journal – Brill

Published: Jan 1, 1981

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