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Action Potentials and Slow Wave Potentials Exhibit Distinct Phloem Propagation Velocities in Vicia faba
Francisco Ibacache-Carrión1,2, Yasnaya Bolua-Hernández2,3, Erwan Michard3
1Laboratorio de Interacciones Insecto-Planta, Instituto de Ciencias Biológicas, Universidad de Talca, Talca, Chile.
Physiologia Plantarum
|August 14, 2026
Summary
Plant electrical signals, action potentials (APs) and variation potentials (VPs), travel through vascular tissues. This study reveals distinct propagation patterns and functional roles for APs and VPs in response to physical stimuli.
Area of Science:
- Plant electrophysiology
- Plant signaling
- Bioelectricity
Background:
- Plant vascular bundles facilitate electrical signal propagation, including action potentials (APs) and variation potentials (VPs).
- The precise mechanisms governing the propagation of these plant electrical signals remain largely unknown.
- Understanding these signals is crucial for deciphering plant responses to environmental stimuli.
Purpose of the Study:
- To investigate the mechanisms and characteristics of plant electrical signal propagation (APs and VPs) in response to physical stimuli.
- To differentiate the propagation velocities and behaviors of APs and VPs.
- To explore the functional impact of these electrical signals on insect behavior.
Main Methods:
- Utilized aphids as bioelectrodes to record electrical signals in *Vicia faba*.
- Applied physical stimuli (cutting and burning) to induce APs and VPs.
- Analyzed signal propagation velocity, duration, amplitude, and directionality.
Main Results:
- Cut-induced APs propagated rapidly (2.6 cm/s) and briefly (3 s), while flame-induced VPs were slower (0.38 cm/s) and longer-lasting (45 s).
- APs showed similar acropetal and basipetal propagation, whereas VPs moved faster acropetally, indicating different mechanisms.
- Flame-induced VPs altered aphid feeding behavior, causing shifts from phloem ingestion to salivation, unlike APs.
Conclusions:
- Demonstrated that both APs and VPs propagate through the phloem with distinct directional characteristics.
- Provided evidence for differential functional roles of APs and VPs in plant systemic communication following physical damage.
- Highlighted the potential of VPs to influence insect behavior, suggesting a role in plant defense or interaction.
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