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Related Concept Videos

Cell Adhesion in Plants01:14

Cell Adhesion in Plants

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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.
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 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.
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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...
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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.
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Structural Characterization of Mannan Cell Wall Polysaccharides in Plants Using PACE
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Xylan-based nanocompartments orchestrate plant vessel wall patterning.

Hang Wang1, Hanlei Yang1,2, Zhao Wen1,2

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Plant cell walls use xylan-rich nanocompartments at pit borders to anchor cellulose, ensuring robust water transport. This discovery reveals how xylans build these structures, vital for plant transpiration.

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Area of Science:

  • Plant Biology
  • Cell Biology
  • Biochemistry

Background:

  • Cellular processes rely on biomacromolecule nanoclustering for efficiency.
  • Plant cell walls, though organized, exhibit complex polysaccharide heterogeneity.
  • Polysaccharide-based nanocompartments in cell walls are not well understood.

Purpose of the Study:

  • To identify and characterize polysaccharide-based nanocompartments in plant cell walls.
  • To elucidate the role of these nanocompartments in xylem vessel structure and function.
  • To determine the mechanism of xylan synthesis and its role in nanocompartment formation.

Main Methods:

  • Identification of xylan-rich nanodomains using advanced imaging techniques.
  • Analysis of the function of IRREGULAR XYLEM (IRX)10 and its homologues.
  • Investigating the interaction between xylans and cellulosic nanofibrils.

Main Results:

  • A novel xylan-rich nanodomain was identified at xylem vessel pit borders.
  • These nanocompartments anchor cellulosic nanofibrils, maintaining specific wall patterns.
  • IRREGULAR XYLEM (IRX)10 and its homologs were confirmed as de novo xylan synthases.

Conclusions:

  • Xylan synthesis by IRX10 family enzymes forms specific nanocompartments.
  • These nanocompartments are crucial for xylem vessel integrity, water transport, and leaf transpiration.
  • The study provides a mechanism for xylan-driven nanocompartment assembly and cell wall patterning.