title: Low-temperature-induced transmembrane potential changes in mesophyll cells of Arabidopsis thaliana, Helianthus annuus and Vicia faba.
abstract: Glass microelectrodes were inserted into mesophyll cells of intact leaves from higher plants: Arabidopsis thaliana, Helianthus annuus and Vicia faba var minor, and transient membrane potential changes were recorded in response to a sudden temperature drop. The cold-induced potential changes were unaffected by an anion channel inhibitor (anthracene-9-carboxylic acid) and potassium channel inhibitor (tetraethyl ammonium ion). Verapamil, a calcium channel inhibitor, caused significant suppression of the cold-induced potential changes. In the presence of calmoduline antagonists (trifluoperazine and N-6-aminohexyl-5-chloro-1-naphtalenesulphonamide), their amplitudes decreased and their durations were prolonged. Neomycin, which suppresses phospholipase C, also caused substantial inhibition of the amplitudes of the cold-induced potential changes. It is concluded that cold-evoked membrane potential changes are due to calcium influxes from both the apoplast and internal stores.
authors.affiliation: Department of Biophysics, Institute of Biology, Maria Curie-Skłodowska University, Akademicka 19, 20-033 Lublin, Poland.
authors.forename: Elzbieta
authors.initials: E
authors.lastname: Krol
authors.forename: Halina
authors.initials: H
authors.lastname: Dziubińska
authors.forename: Kazimierz
authors.initials: K
authors.lastname: Trebacz