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Journal of Experimental Botany, Vol. 54, No. 381, pp. 335-344, January 2, 2003
© 2003 Oxford University Press

Xyloglucan endotransglucosylase action is high in the root elongation zone and in the trichoblasts of all vascular plants from Selaginella to Zea mays

Received 9 April 2002; Accepted 26 August 2002

K. Vissenberg1, V. Van Sandt1, S. C. Fry2 and J-P. Verbelen3,1

1 Laboratory of Plant Physiology and Morphology, Department of Biology, University of Antwerp (UIA), Universiteitsplein 1, B-2610 Wilrijk, Belgium
2 Edinburgh Cell Wall Group, Institute of Cell and Molecular Biology, The University of Edinburgh, Daniel Rutherford Building, The King’s Buildings, Edinburgh EH9 3JH, UK

3 To whom correspondence should be addressed. Fax: +32 3 820 2271. E-mail: Jean-pierre.verbelen{at}ua.ac.be
Abbreviations: GAX, glucuronoarabinoxylan; XET, xyloglucan endotransglucosylase (=name of enzyme activity or action); XGO-SR, sulphorhodamine-labelled xyloglucan oligosaccharide; XTH, xyloglucan endotransglucosylase/hydrolase (=name of protein); XyG, xyloglucan.

The endotransglucosylase action of the enzyme xyloglucan endotransglucosylase/hydrolase (XTH) was localized in the roots of diverse vascular plants: club-mosses (lycopodiophytes), ferns, gymnosperms, monocots, and dicots. High action was always found in the epidermis cell wall of the elongation zone and in trichoblasts in the differentiation zone. Clearly XTH and its action in root development evolved before the evolutionary divergence of ferns and seed plants and also of the lycopodiophytes and euphyllophytes.

Key words: Club-mosses, ferns, roots, seed plants, xyloglucan endotransglucosylase/hydrolase (XTH).


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