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AOBPreview originally published online on October 2, 2002
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Annals of Botany 90: 669-676, 2002
© 2002 Annals of Botany Company

Cellulose Orientation in the Outer Epidermal Wall of Angiosperm Roots: Implications for Biosystematics

SVEN KERSTENS1 and JEAN-PIERRE VERBELEN*,1

1 University of Antwerp UIA, Department of Biology, Universiteitsplein 1, B-2610 Wilrijk, Belgium

* For correspondence. Fax +32 3 820 22 71, e-mail jean-pierre.verbelen{at}ua.ac.be

Received: 29 April 2002; Returned for revision: 3 July 2002; Accepted: 28 July 2002 Published electronically: 2 October 2002

The net orientation of cellulose fibrils in the outer epidermal wall of the root elongation zone of 57 angiosperm species belonging to 29 families was determined by means of Congo Red fluorescence and polarization confocal microscopy. The angiosperms can be divided in three groups. In all but four plant families, the net orientation of the cellulose fibrils is transverse to the root axis. Three families, the Poaceae, Juncaceae and Cyperaceae, have a totally different organization. In the root elongation zone of these plants, the net orientation of cellulose fibrils in the outer epidermal wall is parallel with the root axis. In roots of one family, the Arecaceae, an elongation zone in the literal sense of the word is absent and cellulose fibrils are randomly oriented.

Key words: Cell wall, cellulose fibrils, Congo Red, polarized confocal microscopy, commelinoid monocotyledons, Poales, Poaceae, Cyperaceae, Juncaceae.


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