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Research Papers

Light- and dark-induced Action Potentials in Physcomitrella patens

Mateusz Koselski, Kazimierz Trebacz, Halina Dziubinska and Elzbieta Krol

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Glass microelectrodes were inserted into Physcomitrella patens gametophyte leaves and action potentials (APs) were recorded in response to sudden illumination as well as after darkening, i.e. when the dark-induced membrane depolarization crossed a threshold. Application of 5 mM La³⁺ (a calcium channel inhibitor), 10 mM TEA⁺ (a potassium channel inhibitor), and increased free Ca²⁺ resulted in a loss of excitability. Lack of Ca²⁺ in the external medium did not prevent APs from occurring. It was concluded that during light- dark-induced excitation of Physcomitrella patens, APs might rely upon calcium influxes from the intracellular compartments. APs were not blocked by the proton pump inhibitors (DES, DCCD), although the resting potential (RP) diminished significantly.

Authors

Mateusz Koselski

Department of Biophysics, Institute of Biology, Maria Curie-Skłodowska University, Lublin, Poland

Kazimierz Trebacz

Department of Biophysics; Institute of Biology; Maria Curie-Sklodowska University; Lublin, Poland

Halina Dziubinska

Department of Biophysics, Institute of Biology, Maria Curie-Skłodowska University, Lublin, Poland

Elzbieta Krol

Department of Biophysics, Institute of Biology, Maria Curie-Skłodowska University, Lublin, Poland

Purchase article for $19

Subscribe to this journal for $79/year