Cell Wall Dynamics in Plant Systems

Plant cell walls are dynamic, composite structures that underpin growth, development and environmental responses. Comprising a network of cellulose microfibrils embedded in a matrix of hemicelluloses, pectins and structural proteins, walls undergo controlled loosening, expansion and reinforcement. During cell elongation, expansins and xyloglucan endotransglucosylase/hydrolases cleave cross-links between cellulose and hemicellulose, allowing turgor-driven expansion. Subsequent wall stiffening involves deposition of additional polysaccharides, lignin in secondary walls and covalent scaffolds formed by hydroxyproline-rich glycoproteins such as extensins. Biosynthesis and assembly of these components are orchestrated by glycosyltransferases and peroxidases within the endoplasmic reticulum and Golgi apparatus, before targeted delivery to the wall. Cell wall remodelling regulates diverse processes—from fruit ripening and cell differentiation to defence against pathogens and adaptation to abiotic stresses. Advances in imaging, biochemical and genetic tools have revealed spatio-temporal patterns of polymer network reorganisation, highlighting the cell wall as a finely tuned interface between plant cells and their environment.

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Cell Wall Dynamics in Plant Systems publication trend

The graph below shows the total number of articles in cell wall dynamics in plant systems across all publications each year (not limited to Nature Index journals).

Technical terms

Cellulose: Linear chains of β-1,4-linked glucose that form microfibrils, providing tensile strength.

Hemicellulose: Heterogeneous polysaccharides (e.g. xyloglucans) that tether cellulose microfibrils and regulate wall extensibility.

Pectin: Galacturonic acid-rich polysaccharides that confer porosity, hydration and adhesion within the primary wall.

Expansin: Non-enzymatic proteins that disrupt hydrogen bonds between cellulose and hemicellulose, facilitating wall loosening.

Extensin: Hydroxyproline-rich glycoproteins that form covalent cross-links and scaffolds, contributing to wall stiffening.

Glycosyltransferase: Enzymes that catalyse the addition of sugar residues to polysaccharides or proteins during wall assembly.

Arabinogalactan-protein (AGP): Heavily glycosylated cell surface proteins involved in cell adhesion, signalling and wall structure.

References

1. In vivo and ex vivo study on cell wall components as part of the network in tomato fruit during the ripening process. Horticulture Research (2024).
2. Extensin and Arabinogalactan-Protein Biosynthesis: Glycosyltransferases, Research Challenges, and Biosensors. Frontiers in Plant Science (2016).
3. Ectopic expression of a novel OsExtensin‐like gene consistently enhances plant lodging resistance by regulating cell elongation and cell wall thickening in rice. Plant Biotechnology Journal (2017).
4. An update on post-translational modifications of hydroxyproline-rich glycoproteins: toward a model highlighting their contribution to plant cell wall architecture. Frontiers in Plant Science (2014).