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A xyloglucan endotransglucosylase/hydrolase involves in growth of primary root and alters the deposition of cellulose in Arabidopsis

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Abstract

Xyloglucan endotransglucosylase/hydrolases (XTHs) are a class of enzymes that mediate the construction and restructure of the cellulose/xyloglucan framework by splitting and reconnecting xyloglucan molecule cross-linking among cellulose microfibrils. Remodification of cellulose microfibrils within cell-wall matrices is realized to be one of the most critical steps in the regulation of cells expansion in plants. Thirty-three XTH genes have been found in Arabidopsis thaliana but their roles remain unclear. AtXTH21 (At2g18800), an Arabidopsis XTH gene that mainly expresses in root and flower, exhibits different expression profiles from other XTH members under hormone treatment. We examined loss-of-function mutants using T-DNA insertion lines and overexpression lines and found that the AtXTH21 gene played a principal role in the growth of the primary roots by altering the deposition of cellulose and the elongation of cell wall.

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Abbreviations

GUS:

β-Glucuronidase

XTH:

Xyloglucan endotransglucosylase/hydrolase

XET:

Xyloglucan endotransglucosylase

CesA:

Cellulose synthetase

Mr :

Relative mass molecular weight

XGO:

Xyloglucan oligosaccharide

APTS:

9-Aminopyrene-1, 4, 6-trisulfonate

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Acknowledgments

This work was supported in part by the National Natural Science Foundation of China (Grant No. 30521004), the Program for Changjiang Scholars and Innovative Research Team in University and Key Grant Project of Chinese Ministry of Education (#307018) to Y.-T.L. Thanks are also given to anonymous reviewers for their constructive comments.

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Liu, YB., Lu, SM., Zhang, JF. et al. A xyloglucan endotransglucosylase/hydrolase involves in growth of primary root and alters the deposition of cellulose in Arabidopsis . Planta 226, 1547–1560 (2007). https://doi.org/10.1007/s00425-007-0591-2

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  • DOI: https://doi.org/10.1007/s00425-007-0591-2

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