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Effect of ion channel blockers and H$^{+}$-ATPase inhibitors on generation of local electrical response in a cucumber leaf

Content Provider	Springer Nature Link
Author	Prudnikov, G. A. Panichkin, L. A. Krasavina, M. S.
Copyright Year	2010
Abstract	Electric potential difference was measured with extracellular electrodes between the leaf surface of 2-week-old cucumber (Cucumis sativus L.) plants and soil solution. When the leaf region with a diameter of 5 mm was gradually cooled during a 105-s period to 8–9°C, the temperature drop induced a local (confined to the cooled area) nonpropagating pulse-wise electric activity. The cessation of cooling was followed by gradual (within 12–15 min) restoration of the initial potential difference. Two peaks of electric potential with amplitudes of 100–120 mV usually appeared upon cooling. The first depolarizing stage of the pulse activity was sensitive to inhibition of voltage-gated and mechanosensitive calcium channels of plasmalemma by lanthanum and gadolinium chlorides and to verapamil treatment. Furthermore, the inhibition of this stage by ruthenium red implies the release of calcium ions from intracellular stores. The initial slow depolarization was followed by a fast depolarizing shift, which was sensitive to La$^{3+}$ and the anion channel inhibitor 4-acetamido-4′-isothiocyano-stilbene-2,2′-dilsulfonic acid. At the next stage repolarization developed, which was sensitive to potassium channel blockers, tetraethylammonium and quinine sulfate. The influence of ion channels blockers indicates that generation of local bioelectric response is based on fluxes of the same ion species that are involved in the action potential. The depolarization stage was due to the transient Ca$^{2+}$ influx into the cytosol from the apoplast and intracellular stores, together with the anion efflux from the cell; the repolarization stage involved potassium ions. Both stages of electric pulse generation were retarded by the H$^{+}$-ATPase inhibitors, sodium orthovanadate and dicyclohexylcarbodiimide, which implies the involvement of the proton pump in the origin of electric pulses examined.
Starting Page	865
Ending Page	874
Page Count	10
File Format	PDF
ISSN	10214437
Journal	Russian Journal of Plant Physiology
Volume Number	57
Issue Number	6
e-ISSN	16083407
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2010-10-31
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cucumis sativus leaf chilling temperature local electric response Plant Sciences Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Plant Science

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