Cited by 232Polysaccharides and Plant Cell WallsPostharvest Quality and Shelf Life ManagementPlant Molecular Biology Research

The DOI matches its Crossref record; 53 of the 53 references it cites were found in a registry or an index.

GDP‐d‐mannose 3,5‐epimerase (GME) plays a key role at the intersection of ascorbate and non‐cellulosic cell‐wall biosynthesis in tomato

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Abstract

Summary: The GDP‐d‐mannose 3,5‐epimerase (GME, EC 5.1.3.18), which converts GDP‐d‐mannose to GDP‐l‐galactose, is generally considered to be a central enzyme of the major ascorbate biosynthesis pathway in higher plants, but experimental evidence for its role in planta is lacking. Using transgenic tomato lines that were RNAi‐silenced for GME, we confirmed that GME does indeed play a key role in the regulation of ascorbate biosynthesis in plants. In addition, the transgenic tomato lines exhibited growth defects affecting both cell division and cell expansion. A further remarkable feature of the transgenic plants was their fragility and loss of fruit firmness. Analysis of the cell‐wall composition of leaves and developing fruit revealed that the cell‐wall monosaccharide content was altered in the transgenic lines, especially those directly linked to GME activity, such as mannose and galactose. In agreement with this, immunocytochemical analyses showed an increase of mannan labelling in stem and fruit walls and of rhamnogalacturonan labelling in the stem alone. The results of MALDI‐TOF fingerprinting of mannanase cleavage products of the cell wall suggested synthesis of specific mannan structures with modified degrees of substitution by acetate in the transgenic lines. When considered together, these findings indicate an intimate linkage between ascorbate and non‐cellulosic cell‐wall polysaccharide biosynthesis in plants, a fact that helps to explain the common factors in seemingly unrelated traits such as fruit firmness and ascorbate content.

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Crossref · 10.1111/j.1365-313x.2009.03972.x

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Metadata

Authors
Gilbert, L., Alhagdow, M., Nunes‐Nesi, A., Quemener, B., Guillon, F., Bouchet, B., Faurobert, M., Gouble, B., Page, D., Garcia, V., Petit, J., Stevens, R., Causse, M., Fernie, A. R., Lahaye, M., Rothan, C., & Baldet, P.
Affiliations
  • Université de Bordeaux (FR)
  • Max Planck Institute of Molecular Plant Physiology (DE)
  • Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement (FR)
Corresponding author
Baldet, Pierre
Venue
The Plant Journal
Publisher
Wiley
Published
2009-10-28
Volume
60
Issue
3
Pages
499-508
ISSN
  • 0960-7412 (ISSN-L)
  • 1365-313X
OpenAlex
W2162743448
Cited by
232
References
53
Citations by year
2026: 5 · 2025: 10 · 2024: 10 · 2023: 12 · 2022: 15 · 2021: 13 · 2020: 23 · 2019: 11 · 2018: 12 · 2017: 15 · 2016: 16 · 2015: 11 · 2014: 16 · 2013: 15 · 2012: 24
FWCI
19.39
Type
journal article
Language
en
Open access
Locations
  • The Plant Journal (publishedVersion)
  • PubMed (publishedVersion)
  • HAL (submittedVersion)
Funders
Institut National de la Recherche Agronomique
Topics
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Polysaccharides and Plant Cell Walls
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Postharvest Quality and Shelf Life Management
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Molecular Biology Research
Keywords
ascorbic acid biosynthesis, tomato, mannan, rhamnogalacturonan, fruit firmness, mannose, galactose, RNA interference
MeSH terms
Ascorbic Acid, Carbohydrate Epimerases, Cell Wall, Polysaccharides, Oxidative Stress, Gene Expression Regulation, Plant, Solanum lycopersicum, Plants, Genetically Modified, RNA Interference

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