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Transmembrane electrical potentials in growing maize roots : Anti-auxin effects
M M Moloney1, P E Pilet, M T Marrè
1Institut de Biologie et de Physiologie Végétales, Université de Lausanne, Place de la Riponne 6, CH-1005, Lausanne, Switzerland.
Planta
|November 26, 2013
Summary
The anti-auxin 4-chlorophenoxyisobutyric acid (PCIB) induces electrical potential and proton extrusion in maize roots. These effects, linked to auxin activity, are inhibited by FCCP.
Area of Science:
- Plant Physiology
- Molecular Biology
- Biophysics
Background:
- Auxin is a key plant hormone regulating growth and development.
- Understanding auxin's role in cellular electrical signaling is crucial.
Purpose of the Study:
- To investigate the effect of the anti-auxin PCIB on maize root cell electrical potential.
- To explore the relationship between PCIB-induced electrical changes and proton extrusion.
Main Methods:
- Application of 4-chlorophenoxyisobutyric acid (PCIB) to maize root segments.
- Measurement of transmembrane electrical potential (Δpd).
- Assessment of H(+)-extrusion kinetics and effects of FCCP and fusicoccin (FC).
Main Results:
- PCIB induced a significant transmembrane electrical potential and H(+)-extrusion.
- These effects were abolished by FCCP, indicating an energy-dependent process.
- Combined FC and PCIB treatment did not enhance hyperpolarization beyond FC alone.
Conclusions:
- Results suggest an electrogenic proton pump is involved in PCIB's action.
- This pump may be regulated by cellular auxin levels or activity.
- PCIB influences maize root electrophysiology, potentially via auxin signaling pathways.
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