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General Physiology and Biophysics 2011 General Physiology and Biophysics Vol.30, No.1, p.52–58, 2011
General Physiology and Biophysics 2011 General Physiology and Biophysics Vol.30, No.1, p.52–58, 2011
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General Physiology and Biophysics Vol.30, No.1, p.52–58, 2011 |
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| Title: Effect of cadmium and lead on the membrane potential and photoelectric reaction of Nitellopsis obtusa cells | ||
| Author: Renata Kurtyka, Zbigniew Burdach, Waldemar Karcz | ||
| Abstract: The effects of Cd and Pb on membrane potential (Em) and photoelectric reaction of Nitellopsis obtusa cells were investigated. It was found that Cd and Pb at 1.0 mM caused a depolarization of the Em, whereas both metals at lower concentrations changed the Em in a different way. Pb at 0.1 mM and 0.01 mM hyperpolarized the Em, whereas Cd at the same concentrations depolarized and did not change the Em, respectively. In the presence of 0.01 mM Pb, the light-induced hyperpolarization of the Em was by 18% higher as compared to the control, whereas at 1.0 mM Pb it was by 40% lower. Pb at 0.1 mM and Cd at 0.01 mM or 5 × 0.01 mM did not change the light-induced membrane hyperpolarization. However, in the presence of Cd at 0.1 mM and 1.0 mM this hyperpolarization was 2-fold lower or was completely abolished, respectively. These results suggest that at high Cd and Pb concentrations both depolarization of the Em and decrease of light-induced membrane hyperpolarization in Nitellopsis obtusa cells are probably due to inhibition of the plasma membrane H+-ATPase activity, whereas both metals at lower concentrations differ in mechanism of membrane potential changes. |
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| Keywords: Cadmium — Lead — Membrane potential — Photoelectric reaction — Nitellopsis obtusa | ||
| Year: 2011, Volume: 30, Issue: 1 | Page From: 52, Page To: 58 | |
| doi:10.4149/gpb_2011_01_52 |
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2011 Special Issue |