Related Experiment Video
Updated: May 27, 2026
09:27
High Resolution Quantification of Crystalline Cellulose Accumulation in Arabidopsis Roots to Monitor Tissue-specific Cell Wall Modifications
Published on: May 10, 2016
Cellulose synthesis in two secondary cell wall processes in a single cell type
Venugopal Mendu1, Jozsef Stork, Darby Harris
1Department of Horticulture, University of Kentucky, Lexington, KY, USA.
Plant Signaling & Behavior
|November 8, 2011
Summary
Plant cells use cellulose synthase (CESA) proteins for secondary cell wall formation. This study reveals specialized CESA roles in Arabidopsis seed coat epidermal cells for mucilage production and radial wall thickening.
Area of Science:
- Plant Biology
- Cell Biology
- Biochemistry
Background:
- Plant cells possess a rigid cell wall crucial for maintaining turgor pressure and enabling shape acquisition.
- Cellulose microfibrils are the primary load-bearing components of plant cell walls, organized according to cellular function and shape.
- Secondary cell walls are synthesized during cell differentiation, following primary cell wall deposition during expansion.
Purpose of the Study:
- To investigate the complex roles of cellulose biosynthesis in differentiated Arabidopsis seed coat epidermal cells.
- To elucidate the specific functions of different cellulose synthase (CESA) proteins in secondary cell wall formation.
- To present a model for the complexity of cellulose biosynthesis in this specialized cell type.
Main Methods:
- Analysis of secondary cell wall processes in Arabidopsis seed coat epidermal cells.
- Investigating the roles of specific cellulose synthase (CESA) proteins, including CESA2, CESA5, and CESA9.
- Characterization of pectinaceous mucilage production and radial wall thickening.
Main Results:
- Two distinct secondary cell wall processes were identified, utilizing different CESA proteins.
- CESA5 is polarized for mucilage attachment to the parent seed.
- CESA2, CESA5, and CESA9 are involved in radial cell wall thickening and columella formation.
Conclusions:
- Arabidopsis seed coat epidermal cells exhibit complex, asymmetrical cellular differentiation involving specialized cellulose biosynthesis.
- Distinct CESA proteins play specific roles in producing extracellular matrix components like mucilage and structural reinforcements.
- The findings support a model for the intricate nature of cellulose biosynthesis in highly differentiated plant cells.
Related Concept Videos
01:02Role of Microtubules in Cell Wall Deposition
Microtubules are small hollow tubes in eukaryotic cells. The cell wall microtubules are polymerized dimers of two globular proteins, α-tubulin and β-tubulin, two globular proteins. With a diameter of about 25 nm, microtubules are the widest components of the cytoskeleton. They help the cell resist compression and provide a track along which vesicles move through the cell or pull replicated chromosomes to opposite ends of a dividing cell. Microtubules go through quick cycles of disassembly and...
01:15Cellulose and Pectic Polysaccharides
Every plant cell has a cell wall that protects the cell, provides structural support, and gives the cell shape. Cellulose, the main structural component of the plant cell wall, makes up over 30% of plant matter. It is the most abundant organic compound on earth. Cellulose is an unbranched polysaccharide composed of linear chains of glucose molecules linked by β (1→4) glycosidic bonds.
As a cell matures, its cell wall specializes according to its type. For example, the parenchyma cells of...
As a cell matures, its cell wall specializes according to its type. For example, the parenchyma cells of...
02:43Plant Cell Wall
The plant cell wall gives plant cells shape, support, and protection. As a cell matures, its cell wall specializes according to the cell type. For example, the parenchyma cells of leaves possess only a thin, primary cell wall.
01:07Plant Cell Wall
Plant cells have a cell wall, a rigid outer covering that protects the cell and provides shape and support. During cell division, a mixture of enzymes, proteins, and glucose molecules is transported via vesicles to the center of the cell. These vesicles continuously fuse and build a cell plate between the dividing cells. As the cell plate matures, new polysaccharides are added to it to form the cell walls of the daughter cells. The predominant polysaccharide in the cell wall is cellulose, made...
01:59The Phragmoplast
Cell division is essential for organismal growth and development. In animal cells, the central spindle and its associated proteins form the midbody, a structure that has an essential role in cytokinesis. In plants, the central spindle, along with the microtubules, actin, and other cell components, matures into the phragmoplast, which is necessary for cytokinesis. Unlike the stationary midbody, the phragmoplast expands centrifugally, eventually leading to the formation of the new cell wall.
The...
The...
01:14Cell Adhesion in Plants
Plants have rigid cell walls that are made up of cell wall polysaccharides that mediate cell-cell adhesion. The primary cell walls of plants consist of two independent and interacting polysaccharide networks: a pectin matrix that embeds the second network comprising cellulose and hemicelluloses.
Pectins are complex heteropolymers mainly composed of negatively-charged α-D-glucopyranosyl uronic acid and some neutral glycosyl residues such as α-L-rhamnopyranose, α-L-arabinofuranose, and...
Pectins are complex heteropolymers mainly composed of negatively-charged α-D-glucopyranosyl uronic acid and some neutral glycosyl residues such as α-L-rhamnopyranose, α-L-arabinofuranose, and...