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Related Experiment Videos

Silica in higher plants.

A G Sangster, M J Hodson

    Ciba Foundation Symposium
    |January 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    Vascular plants absorb silica, influencing plant structure and potentially human health. Research explores plant silica pathways and deposition mechanisms using advanced microscopy techniques.

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    Area of Science:

    • Plant Biology
    • Biogeochemistry
    • Materials Science

    Background:

    • Opaline silica is produced by numerous vascular plants, with significant variation in absorption capacity based on genotype and environment.
    • Plant communities play a role in silica exchange between soil and vegetation, particularly in warmer climates.
    • Silica deposition in plant cell walls provides mechanical support and protection, but biogenic silica particles are also linked to cancer causation.

    Purpose of the Study:

    • To review recent techniques for identifying plant pathways of soluble silica movement to deposition sites.
    • To determine the ionic environments involved in silica deposition.
    • To investigate the relationship between plant development, cell wall silicification, and silica structure.

    Main Methods:

    Related Experiment Videos

  • Scanning and transmission electron microscopy combined with X-ray microanalysis were employed for botanical investigations.
  • Silica deposition in canary grass (Phalaris) macrohair walls was studied in relation to inflorescence emergence and wall thickening.
  • Transpiration was manipulated by enclosing Phalaris inflorescences in plastic bags to assess its impact on silica deposition.
  • Preliminary freeze-substitution studies were conducted to locate silicon, potassium, and chloride.

    • Main Results:

    • Silica deposition in Phalaris macrohair walls commences at inflorescence emergence and correlates with wall thickening.
    • The structure of deposited silica may be influenced by specific organic polymers during cell wall development.
    • Reduced transpiration led to decreased silica deposition in macrohairs.
    • Silicon, potassium, and chloride were detected in the cell vacuole and wall deposition sites during early silicification.

    Conclusions:

    • Plant silica uptake and deposition are complex processes influenced by environmental factors and plant development.
    • Advanced techniques are crucial for elucidating the mechanisms of biogenic silica formation and its implications.
    • Understanding plant silicification pathways can inform research on plant biomechanics, ecological roles, and potential health impacts.