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Voltage-dependent action potentials in Arabidopsis thaliana
Patrick Favre1, Robert Degli Agosti
1Laboratory of Plant Physiology and Biochemistry, Plant Physiomatics, University of Geneva, 3 Place de l'Université, CH-1211 Geneva 4, Switzerland.
Physiologia Plantarum
|February 7, 2008
Summary
Voltage-elicited action potentials (APs) were successfully generated in Arabidopsis thaliana, demonstrating an all-or-none response. Different ecotypes showed varying excitability, with col being the most responsive.
Area of Science:
- Plant electrophysiology
- Plant signaling
- Action potential generation in plants
Background:
- Action potentials (APs) are fundamental electrical signals in excitable cells.
- Investigating APs in plants can reveal novel signaling mechanisms.
- Arabidopsis thaliana is a model organism for plant research.
Purpose of the Study:
- To reproducibly elicit and characterize voltage-elicited action potentials in Arabidopsis thaliana.
- To determine the excitability parameters and propagation characteristics of plant APs.
- To compare AP elicitation across different Arabidopsis ecotypes.
Main Methods:
- Voltage-elicited action potentials (APs) were induced using controlled voltage-duration (V-t) pulses applied to Arabidopsis thaliana leaves.
- Electrical recordings were made using conventional liquid junction Ag/AgCl electrodes placed at specific leaf and petiole zones.
- Propagation speed, refractory periods, and response characteristics were analyzed.
Main Results:
- Reproducible voltage-elicited APs were obtained in Arabidopsis thaliana ecotype col, exhibiting a hyperbolic V-t relationship.
- APs demonstrated an all-or-none response, with propagation speeds of 1.15 +/- 0.26 mm/s and refractory periods of approximately 20-80 minutes.
- Significant differences in AP elicitation and propagation were observed across ecotypes, with col being highly responsive, Wassilewskija partially responsive, and Lansberg erecta non-responsive.
Conclusions:
- Voltage stimulation can reliably elicit action potentials in Arabidopsis thaliana, providing a tool for studying plant electrical signaling.
- Plant APs exhibit distinct electrophysiological properties, including all-or-none responses and slow propagation speeds.
- Ecotype-specific differences in excitability highlight genetic variations in electrical signaling pathways within Arabidopsis.
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01:41Action Potentials
Overview
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Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
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01:28Action Potential: Phases of Stimulation
The action potential is a complex electrical event that occurs in excitable cells, such as neurons and muscle cells. It consists of several distinct phases, each with specific characteristics.
Resting Phase:
In this phase, the cell's membrane is at its resting potential, typically around -70 millivolts (mV) for neurons. Inside the cell, there is a higher concentration of potassium ions (K+) and a lower concentration of sodium ions (Na+). Voltage-gated sodium channels are closed, and...
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01:23Propagation of Action Potentials
The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
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