Planta

, Volume 226, Issue 6, pp 1547–1560

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

  • Ya-Bao Liu
  • Si-Min Lu
  • Jian-Feng Zhang
  • Sheng Liu
  • Ying-Tang Lu
Original Article

DOI: 10.1007/s00425-007-0591-2

Cite this article as:
Liu, YB., Lu, SM., Zhang, JF. et al. Planta (2007) 226: 1547. doi:10.1007/s00425-007-0591-2

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.

Keywords

XyloglucanEndotransglucosylase/hydrolasesCell wallCelluloseRoot growth

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

Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Ya-Bao Liu
    • 1
  • Si-Min Lu
    • 1
  • Jian-Feng Zhang
    • 1
  • Sheng Liu
    • 1
  • Ying-Tang Lu
    • 1
  1. 1.Key Lab of MOE for Plant Developmental Biology, College of Life SciencesWuhan UniversityWuhanChina