Mutation of the chitinase-like protein-encoding AtCTL2 gene enhances lignin accumulation in dark-grown Arabidopsis seedlings

Md Aktar Hossain, Ha Na Noh, Kang Il Kim, Eun Ji Koh, Seung Gon Wi, Hyun Jong Bae, Hojoung Lee, Suk Whan Hong

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Several genes that encode a chitinase-like protein (called the CTL group) have been identified in Arabidopsis, rice, pea, and cotton. Members of the CTL group have attracted much attention because of their possible role in the biosynthesis of the cell wall in plants. The hot2 mutation in the CTL1 (AtCTL1) gene of Arabidopsis thaliana causes multiple defects in growth and development. The Arabidopsis genome possesses the AtCTL2 gene, which exhibits 70% similarity to AtCTL1 at the amino acid level. We showed that the AtCTL2 gene was predominantly expressed in stems, which was in contrast to the presence of AtCTL1 transcripts in most organs of Arabidopsis. In addition, β-glucuronidase (GUS) staining was detectable in all tissues of the stem in transgenic plants expressing the AtCTL1::GUS construct, while GUS activity under control of the AtCTL2 promoter was significantly restricted to the xylem and to interfascicular fibers in stems. The phenotypes of atctl2 single mutant and of hot2, atctl2 double mutant plants were significantly similar to those of wild-type and of hot2 single mutant plants, respectively. The expression levels of CESA1 and CESA4 transcripts were not affected in the two single mutants or corresponding double mutant plants, compared with the levels in wild-type plants. The accumulation of lignin in etiolated hypocotyls, however, was increased by mutation of AtCTL2. These findings suggest that AtCTL2 is required for proper cell wall biosynthesis in etiolated seedlings of Arabidopsis.

Original languageEnglish
Pages (from-to)650-658
Number of pages9
JournalJournal of Plant Physiology
Volume167
Issue number8
DOIs
Publication statusPublished - 2010 May 15

Fingerprint

Chitinases
Lignin
chitinase
Seedlings
Arabidopsis
lignin
Glucuronidase
mutation
mutants
Mutation
seedlings
Genes
Proteins
genes
proteins
Cell Wall
stems
cell walls
biosynthesis
Hypocotyl

Keywords

  • Cell wall
  • Chitinase-like protein
  • Functional redundancy
  • Lignin
  • T-DNA insertion

ASJC Scopus subject areas

  • Plant Science
  • Physiology
  • Agronomy and Crop Science

Cite this

Mutation of the chitinase-like protein-encoding AtCTL2 gene enhances lignin accumulation in dark-grown Arabidopsis seedlings. / Aktar Hossain, Md; Noh, Ha Na; Kim, Kang Il; Koh, Eun Ji; Wi, Seung Gon; Bae, Hyun Jong; Lee, Hojoung; Hong, Suk Whan.

In: Journal of Plant Physiology, Vol. 167, No. 8, 15.05.2010, p. 650-658.

Research output: Contribution to journalArticle

Aktar Hossain, Md ; Noh, Ha Na ; Kim, Kang Il ; Koh, Eun Ji ; Wi, Seung Gon ; Bae, Hyun Jong ; Lee, Hojoung ; Hong, Suk Whan. / Mutation of the chitinase-like protein-encoding AtCTL2 gene enhances lignin accumulation in dark-grown Arabidopsis seedlings. In: Journal of Plant Physiology. 2010 ; Vol. 167, No. 8. pp. 650-658.
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