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Properties of action potentials in Drosera tentacles.
1Department of Biology, Washington University, St. Louis, Missouri.
Planta
|February 1, 2014
Summary
Action potentials in Drosera tentacles share similarities with vertebrate nerves but exhibit unique brief durations and interval-dependent properties. These findings suggest novel insights into plant neurobiology and signal propagation.
Area of Science:
- Plant Physiology
- Neurobiology
- Biophysics
Background:
- Drosera (sundew) tentacles exhibit electrical excitability.
- Comparison of plant electrical activity with animal nervous systems is of scientific interest.
Purpose of the Study:
- To characterize the action potentials in Drosera tentacles.
- To compare these action potentials with those of vertebrate peripheral nerves.
- To investigate the propagation characteristics of these electrical signals.
Main Methods:
- Electrophysiological recordings from Drosera tentacles.
- Analysis of action potential waveform, refractoriness, and duration.
- Measurement of action potential propagation velocity.
Main Results:
- Drosera action potentials show similarities to vertebrate nerve spikes, including uniform spikes, negative, and positive after-potentials.
- Action potentials during the negative after-potential are abnormally brief compared to nerve potentials.
- Action potential duration is dependent on the preceding interval, a characteristic not typical of peripheral nerves.
Conclusions:
- Drosera tentacles possess a unique form of electrical excitability.
- The observed differences suggest distinct mechanisms underlying signal generation and propagation in plants.
- Electrical coupling between neuroid cells is a possibility supported by artificial propagation reversal.
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