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Transmembrane potential measurements on plant cells using the voltage-sensitive dye ANNINE-6

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Abstract

The charging of the plasma membrane is a necessary condition for the generation of an electric-field-induced permeability increase of the plasmalemma, which is usually explained by the creation and the growth of aqueous pores. For cells suspended in physiological buffers, the time domain of membrane charging is in the submicrosecond range. Systematic measurements using Nicotiana tabacum L. cv. Bright Yellow 2 (BY-2) protoplasts stained with the fast voltage-sensitive fluorescence dye ANNINE-6 have been performed using a pulsed laser fluorescence microscopy setup with a time resolution of 5 ns. A clear saturation of the membrane voltage could be measured, caused by a strong membrane permeability increase, commonly explained by enhanced pore formation, which prevents further membrane charging by external electric field exposure. The field strength dependence of the protoplast’s transmembrane potential V M shows strong asymmetric saturation characteristics due to the high resting potential of the plants plasmalemma. At the pole of the hyperpolarized hemisphere of the cell, saturation starts at an external field strength of 0.3 kV/cm, resulting in a measured transmembrane voltage shift of ∆V M = −150 mV, while on the cathodic (depolarized) cell pole, the threshold for enhanced pore formation is reached at a field strength of approximately 1.0 kV/cm and ∆V M = 450 mV, respectively. From this asymmetry of the measured maximum membrane voltage shifts, the resting potential of BY-2 protoplasts at the given experimental conditions can be determined to V R = −150 mV. Consequently, a strong membrane permeability increase occurs when the membrane voltage diverges |V M| = 300 mV from the resting potential of the protoplast. The largest membrane voltage change at a given external electric field occurs at the cell poles. The azimuthal dependence of the transmembrane potential, measured in angular intervals of 10° along the circumference of the cell, shows a flattening and a slight decrease at higher fields at the pole region due to enhanced pore formation. Additionally, at the hyperpolarized cell pole, a polarization reversal could be observed at an external field range around 1.0 kV/cm. This behavior might be attributed to a fast charge transfer through the membrane at the hyperpolarized pole, e.g., by voltage-gated channels.

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Acknowledgments

This work was supported by the Excellency Programme of the University of Karlsruhe (Shared Research Group SRG60-1) and a Ph.D. fellowship of the Helmholtz Society to B.F.

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The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Karlsruhe Institute of Technology, Institute for Pulsed Power and Microwave Technology (IHM), Forschungszentrum Karlsruhe GmbH, 76344, Eggenstein-Leopoldshafen, Germany

    Bianca Flickinger, Thomas Berghöfer, Christian Eing & Wolfgang Frey

  2. Karlsruhe Institute of Technology, Botanical Institute I—Molecular Cell Biology, University Karlsruhe, 76131, Karlsruhe, Germany

    Petra Hohenberger

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  1. Bianca Flickinger
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  2. Thomas Berghöfer
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  3. Petra Hohenberger
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  4. Christian Eing
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  5. Wolfgang Frey
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Correspondence to Bianca Flickinger.

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Flickinger, B., Berghöfer, T., Hohenberger, P. et al. Transmembrane potential measurements on plant cells using the voltage-sensitive dye ANNINE-6. Protoplasma 247, 3–12 (2010). https://doi.org/10.1007/s00709-010-0131-y

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  • DOI: https://doi.org/10.1007/s00709-010-0131-y

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