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Plant and Cell Physiology, 2003, Vol. 44, No. 5 527-533
© 2003 Oxford University Press

Low-Temperature Induced Transmembrane Potential Changes in the Liverwort Conocephalum conicum

Elzbieta Krol1, Halina Dziubinska and Kazimierz Trebacz

Department of Biophysics, Institute of Biology, Maria Curie-Sklodowska University, Akademicka 19, 20-033 Lublin, Poland

Intracellular microelectrode measurements revealed that the liverwort Conocephalum conicum generates all-or-none action potentials (APs) in response to a sudden temperature drop. In plants with anion and potassium conductance blocked, dose-dependent voltage transients (VTs) were evoked by cold stimuli. These VTs did not propagate. When the external concentration of Ca2+ was decreased or calcium channel inhibitors (La3+, Gd3+, verapamil, Mg2+, Mn2+) were used, inhibition of VTs was observed. Amplitudes of both APs and VTs grew when Sr2+ ions, known to release calcium from internal stores, were added to the medium. Neomycin, which suppresses phospholipase C and indirectly affects inositol triphosphate formation, caused substantial inhibition of both APs and VTs. It is concluded that a temperature drop elucidated membrane potential changes due to calcium influx both from external and internal stores.

1 Corresponding author: E-mail, krolik{at}biotop.umcs.lublin.pl; Fax, +48-81-537-59-01.


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