Document Detail

The extremely low frequency electrical properties of plant stems.
MedLine Citation:
PMID:  3836668     Owner:  NLM     Status:  MEDLINE    
The electrical properties (variation of capacitance and conductance with frequency) of a plant stem can be conveniently measured in vivo by time domain dielectric spectroscopy. In this technique a voltage step is applied to a stem. The resulting polarization current is sampled by a microprocessor and Fourier-transformed to yield these properties. Spectra were obtained for seven electrode separations along a Poinsettia stem. The inverse capacitance and conductance were plotted vs separation for 50 frequencies from .35 to 350 Hz. Least-square fits yielded the effective dielectric constant and conductivity of the stem over this frequency range. In this way electrode effects were eliminated. A similar procedure was carried out for Coleus. A log-log plot of dielectric constant vs frequency shows a two-stage linear decrease for both plants. The conductivity is primarily DC. The dielectric loss decreases smoothly with frequency for Coleus. These results are compared to those for bone and the inorganic material hollandite. The dielectric properties seem best described by a cooperative, many-body approach.
F X Hart
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Bioelectromagnetics     Volume:  6     ISSN:  0197-8462     ISO Abbreviation:  Bioelectromagnetics     Publication Date:  1985  
Date Detail:
Created Date:  1986-07-28     Completed Date:  1986-07-28     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8008281     Medline TA:  Bioelectromagnetics     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  243-56     Citation Subset:  IM    
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MeSH Terms
Electric Conductivity
Plant Physiological Phenomena*
Spectrum Analysis / methods

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