Differential expression of AtXTH17, AtXTH18, AtXTH19 and AtXTH20 genes in Arabidopsis roots. Physiological roles in specification in cell wall construction

Kris Vissenberg, Mika Oyama, Yasue Osato, Ryusuke Yokoyama, Jean Pierre Verbelen, Kazuhiko Nishitani

Research output: Contribution to journalArticlepeer-review

86 Citations (Scopus)

Abstract

Xyloglucan endotransglucosylase/hydrolases (XTHs) are a class of enzymes that are capable of splitting and reconnecting xyloglucan molecules, and are implicated in the construction and restructuring of the cellulose/xyloglucan framework. Thirty-three members of the XTH gene family are found in the genome of Arabidopsis thaliana, but their roles remain unclear. Here, we describe the tissue-specific and growth stage-dependent expression profiles of promoter::GUS fusion constructs for four Arabidopsis XTH genes, AtXTH17, AtXTH18, AtXTH19 and AtXTH20, which are phylogenetically closely related to one another. AtXTH17 and AtXTH18 were expressed in all cell types in the elongating and differentiating region of the root, while AtXTH19 was expressed in the apical dividing and elongating regions, as well as in the differentiation zone, and was up-regulated by auxin. In contrast, AtXTH20 was expressed specifically in vascular tissues in the basal mature region of the root. This expression analysis also disclosed cis-regulatory sequences that are conserved among the four genes, and are responsible for the root-specific expression profile. These results indicate that the four XTH genes, which were generated by gene duplication, have diversified their expression profile within the root in such a way as to take responsibility for particular physiological roles in the cell wall dynamics. JSPP

Original languageEnglish
Pages (from-to)192-200
Number of pages9
JournalPlant and Cell Physiology
Volume46
Issue number1
DOIs
Publication statusPublished - 2005 Jan

Keywords

  • Arabidopsis
  • Auxin
  • Cell wall
  • Promoter
  • Root
  • XTH

ASJC Scopus subject areas

  • Physiology
  • Plant Science
  • Cell Biology

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