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Title: Acetylation of cell wall is required for structural integrity of the leaf surface and exerts a global impact on plant stress responses

Journal Article · · Frontiers in Plant Science
 [1];  [1];  [1];  [2];  [3];  [3];  [1];  [4];  [5];  [6];  [1]
  1. Copenhagen Plant Science Center, Frederiksberg (Denmark); Univ. of Copenhagen (Denmark)
  2. Univ. of California, Davis, CA (United States)
  3. Univ. of Copenhagen (Denmark)
  4. Univ. of Lausanne, Lausanne (Switzerland)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  6. Univ. of California, Davis, CA (United States); Danish National Research Foundation Center DynaMO, Frederiksberg (Denmark)

The epidermis on leaves protects plants from pathogen invasion and provides a waterproof barrier. It consists of a layer of cells that is surrounded by thick cell walls, which are partially impregnated by highly hydrophobic cuticular components. We show that the Arabidopsis T-DNA insertion mutants of REDUCED WALL ACETYLATION 2 (rwa2), previously identified as having reduced O-acetylation of both pectins and hemicelluloses, exhibit pleiotrophic phenotype on the leaf surface. The cuticle layer appeared diffused and was significantly thicker and underneath cell wall layer was interspersed with electron-dense deposits. A large number of trichomes were collapsed and surface permeability of the leaves was enhanced in rwa2 as compared to the wild type. A massive reprogramming of the transcriptome was observed in rwa2 as compared to the wild type, including a coordinated up-regulation of genes involved in responses to abiotic stress, particularly detoxification of reactive oxygen species and defense against microbial pathogens (e.g., lipid transfer proteins, peroxidases). In accordance, peroxidase activities were found to be elevated in rwa2 as compared to the wild type. In conclusion, these results indicate that cell wall acetylation is essential for maintaining the structural integrity of leaf epidermis, and that reduction of cell wall acetylation leads to global stress responses in Arabidopsis.

Research Organization:
University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-05CH11231; 1339125; 1021861; 001-2011-4; 12-131834; AC02–05CH11231
OSTI ID:
1254007
Alternate ID(s):
OSTI ID: 1257260
Journal Information:
Frontiers in Plant Science, Vol. 6; ISSN 1664-462X
Publisher:
Frontiers Research FoundationCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 3 works
Citation information provided by
Web of Science

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Cited By (7)

Comprehensive transcriptome analyses correlated with untargeted metabolome reveal differentially expressed pathways in response to cell wall alterations journal March 2018
TBL10 is required for O -acetylation of pectic rhamnogalacturonan-I in Arabidopsis thaliana journal September 2018
PMR 5, an acetylation protein at the intersection of pectin biosynthesis and defense against fungal pathogens journal October 2019
A Biostimulant Obtained from the Seaweed Ascophyllum nodosum Protects Arabidopsis thaliana from Severe Oxidative Stress journal January 2020
A Biostimulant Obtained from the Seaweed Ascophyllum nodosum Protects Arabidopsis thaliana from Severe Oxidative Stress text January 2020
Report on the Current Inventory of the Toolbox for Plant Cell Wall Analysis: Proteinaceous and Small Molecular Probes journal May 2018
Genome-Wide Analysis of Gene Expression Provides New Insights into Waterlogging Responses in Barley (Hordeum vulgare L.) journal February 2020