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Related Experiment Videos

An electric current associated with gravity sensing in maize roots.

T Björkman1, A C Leopold

  • 1Boyce Thompson Institute for Plant Research, Cornell University, Ithaca, New York 14853-1801, USA.

Plant Physiology
|January 1, 1987
PubMed
Summary

Researchers detected an electric current in maize root caps during gravistimulation, separating gravity sensing from growth. This finding offers a new method for studying plant responses to gravity.

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Area of Science:

  • Plant biology
  • Gravitropism research
  • Plant electrophysiology

Background:

  • Distinguishing gravity sensing from subsequent growth is crucial for understanding plant responses.
  • Current methods often intertwine sensing and growth, complicating analysis.

Purpose of the Study:

  • To develop a method for detecting physiological events of gravity sensing independently of growth.
  • To identify a specific electrical signal associated with gravity perception in maize roots.

Main Methods:

  • Utilized a vibrating probe technique to measure electrical currents.
  • Applied gravistimulation to maize (Zea mays cv Merit) root caps.
  • Quantified changes in endogenous electrical currents in response to gravity.
Keywords:
NASA Discipline Number 40-10NASA Discipline Plant BiologyNASA Program Space BiologyNon-NASA Center

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Main Results:

  • An electric current was detected in the root cap's gravity-sensing region upon gravistimulation.
  • The current shift showed a density of 0.55 microampere/cm² away from gravity.
  • A lag of 3-4 minutes was observed between gravistimulation and the current shift, matching the presentation time for gravity sensing.

Conclusions:

  • The detected electric current is a direct physiological event linked to gravity sensing in maize root caps.
  • This electrical signal provides a means to study gravity sensing independently of differential growth.
  • The findings offer insights into the biophysical mechanisms of plant gravisensing.