Antagonistic functions of CTL1 and SUH1 mediate cell wall assembly in Arabidopsis

Nguyen Thi Thuy; Hyun‐Jung Kim; Suk‐Whan Hong

doi:10.1002/pld3.580

journal article Open Access Mar 01, 2024

Antagonistic functions of CTL1 and SUH1 mediate cell wall assembly in Arabidopsis

Nguyen Thi Thuy

Hyun‐Jung Kim Suk‐Whan Hong

Plant Direct Vol. 8 No. 3 · Wiley

View at Publisher Save 10.1002/pld3.580

Abstract

AbstractPlant genomes contain numerous genes encoding chitinase‐like (CTL) proteins, which have a similar protein structure to chitinase belonging to the glycoside hydrolase (GH) family but lack the chitinolytic activity to cleave the β‐1,4‐glycosidic bond in chitins, polymers of N‐acetylglucosamine. CTL1 mutations found in rice and Arabidopsis have caused pleiotropic developmental defects, including altered cell wall composition and decreased abiotic stress tolerance, likely due to reduced cellulose content. In this study, we identified suppressor of hot2 1 (suh1) as a genetic suppressor of the ctl1hot2‐1 mutation in Arabidopsis. The mutation in SUH1 restored almost all examined ctl1hot2‐1 defects to nearly wild‐type levels or at least partially. SUH1 encodes a Golgi‐located type II membrane protein with glycosyltransferase (GT) activity, and its mutations lead to a reduction in cellulose content and hypersensitivity to cellulose biosynthesis inhibitors, although to a lesser extent than ctl1hot2‐1 mutation. The SUH1 promoter fused with the GUS reporter gene exhibited GUS activity in interfascicular fibers and xylem in stems; meanwhile, the ctl1hot2‐1 mutation significantly increased this activity. Our findings provide genetic and molecular evidence that the antagonistic activities of CTL1 and SUH1 play an essential role in assembling the cell wall in Arabidopsis.

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Details

Published: Mar 01, 2024
Vol/Issue: 8(3)
License: View

Authors

N

Nguyen Thi Thuy

Department of the Integrative Food, Bioscience, and Biotechnology, College of Agriculture and Life Sciences Chonnam National University Gwangju Korea

H

Hyun‐Jung Kim

Department of the Integrative Food, Bioscience, and Biotechnology, College of Agriculture and Life Sciences Chonnam National University Gwangju Korea

S

Suk‐Whan Hong

Department of the Integrative Food, Bioscience, and Biotechnology, College of Agriculture and Life Sciences Chonnam National University Gwangju Korea

Funding

National Research Foundation of Korea Award: NRF‐2022R1A2C1002724

Cite This Article

Nguyen Thi Thuy, Hyun‐Jung Kim, Suk‐Whan Hong (2024). Antagonistic functions of CTL1 and SUH1 mediate cell wall assembly in Arabidopsis. Plant Direct, 8(3). https://doi.org/10.1002/pld3.580

Antagonistic functions of CTL1 and SUH1 mediate cell wall assembly in Arabidopsis

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