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Related Experiment Videos

The exodermis: a variable apoplastic barrier.

E Hose1, D T Clarkson, E Steudle

  • 1Julius-von-Sachs-Institut für Biowissenschaften der Universität, Lehrstuhl Botanik I, Julius-von-Sachs-Platz 2, D-97082 Würzburg, Germany.

Journal of Experimental Botany
|November 16, 2001
PubMed
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Plant root exodermis forms adaptive barriers, regulating water and solute uptake. These Casparian bands and suberin lamellae adjust to environmental stresses, offering a compensatory strategy for nutrient acquisition.

Area of Science:

  • Plant Biology
  • Root Physiology
  • Plant Anatomy

Background:

  • The plant root exodermis, featuring Casparian bands, acts as a variable barrier to radial water and solute flow.
  • Root exodermis structure and anatomy change during development, influencing its resistance to flow.
  • Environmental stresses like drought, anoxia, and salinity impact the formation of apoplastic barriers.

Purpose of the Study:

  • To investigate the role of exodermal barriers in regulating water and solute transport in plant roots.
  • To understand how environmental conditions influence the development and composition of apoplastic barriers.
  • To explore the adaptive significance of exodermal barrier selectivity for plants.

Main Methods:

  • Analysis of exodermal structure and anatomy under varying environmental conditions.

Related Experiment Videos

  • Permeation studies using water, ions, PTS tracer, and ABA to assess barrier function.
  • Chemical analysis of barrier composition (suberin, lignin) in relation to growth regimes.

    • Main Results:

    • Casparian bands and suberin lamellae formation differentially reduce permeability to water and solutes.
    • Apoplastic barriers exhibit selective permeability, demonstrating adaptive functionality.
    • Barrier chemical composition (aliphatic/aromatic suberin, lignin) varies with applied stresses.

    Conclusions:

    • Plants regulate water and solute uptake/loss by controlling the extent and chemical composition of exodermal apoplastic barriers.
    • Exodermal barrier regulation provides a compensatory mechanism for nutrient and water acquisition, complementing membrane-based transport.
    • Adaptive regulation of root hydraulic and solute conductivity is crucial for plant survival under diverse environmental conditions.