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Related Experiment Videos

Factors affecting electrical impedance of internodal stem sections.

D R Evert1

  • 1Department of Plant and Soil Science, University of Vermont, Burlington, Vermont 05401.

Plant Physiology
|March 1, 1973
PubMed
Summary

A novel sample holder enabled accurate electrical impedance measurements in dogwood stems. This method distinguished between healthy and injured tissues, revealing distinct electrical properties of bark and wood.

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Area of Science:

  • Plant physiology
  • Biophysics
  • Electrical engineering

Background:

  • Accurate electrical impedance measurements are crucial for understanding plant tissue properties.
  • Previous methods faced challenges with electrode polarization and electrical interference.
  • Internodal stem sections of Cornus stolonifera Michx. were selected for this study.

Purpose of the Study:

  • To design and construct a sample holder for measuring electrical impedance of plant stems.
  • To develop a method for minimizing sample length dependence in impedance measurements.
  • To assess the sensitivity of the method to tissue injury and differentiate electrical properties of stem components.

Main Methods:

  • A specialized sample holder was engineered for Cornus stolonifera Michx. stem sections.

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  • Manganese dioxide-carbon paste was utilized to prevent electrode polarization and interference.
  • Electrical impedance was measured across a frequency range of 50 Hz to 500 kHz.
  • A normalized impedance magnitude (Z(nf)) was calculated to account for sample length variations.
  • The sample holder's sensitivity to physical injury (boiling, peeling) was evaluated.

    • Main Results:

    • The sample holder facilitated reliable measurement of electrical impedance magnitude and phase angle.
    • The use of manganese dioxide-carbon paste ensured artifact-free measurements.
    • Normalized impedance magnitude effectively minimized sample length dependency.
    • The normalized impedance magnitude showed sensitivity to tissue damage.
    • Distinct electrical properties were observed between the bark and wood tissues.

    Conclusions:

    • The developed sample holder and measurement technique provide a robust method for plant stem electrical impedance analysis.
    • This approach is sensitive to physiological changes and tissue damage.
    • The findings highlight the differential electrical characteristics of bark and wood in Cornus stolonifera Michx.