Excitable Channels in<i>Nitellopsis obtusa</i>as Part of an Active Ion-Transport System

Gyenes, M.; Kurella, G. A.

doi:10.1093/jxb/31.4.937

Cited by 5 publications

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“…However, there is also a group of plants, in which it is possible to produce an action potential (AP) by light stimulus. The group includes some sea algae {Acetabularia -Gradmann 1976), fresh-water algae (Nitellopsis - Gyenes and Kurella 1980;Eremosphaem -Kohler et al 1983), mosses (Bryum -Sinyukhin 1973, and spleenworts (Asplenium - Sinyukhin 1973).…”

Section: Introductionmentioning

confidence: 99%

Light‐triggered action potentials in the liverwort Conocephalum conicum

Trębacz¹,

Zawadzki²

1985

Physiologia Plantarum

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T. 1985. Light-triggered action potentials in the liverwort Conocephalum conicum. -Physiol. Plant. 64: 482-486.The response to light of a liverwort, Conocephalum conicum L., measured as a change in the resting potential, consists of two stages. The first stage is a slight depolarization dependent on light intensity. This plays the role of a generator potential (GP) which induces the second stage -an action potential of the all-or-none character. Action potentials induced by light and by electrical stimuli have the same properties, i.e. identical time course, propagation velocity, and refractory periods. A summation occurs of subthreshold light stimuli and of light and electrical stimuli. The presence of 5-10^ M DCMU cancelled the light response and blocked -by inhibition of the electron transport chain -the mechanism leading to GP generation. However, this effect did not produce any change in the response to electrical stimuli.Additional key words -Action potential, generator potential, stimulus. K. Tr(bacz (reprint requests) and T. Zawadzki,

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Section: Introductionmentioning

confidence: 99%

Light‐triggered action potentials in the liverwort Conocephalum conicum

Trębacz¹,

Zawadzki²

1985

Physiologia Plantarum

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“…The characteristics of the mechanism should also be taken into account, especially the ways of controlling particular ionic channels and the role of the ionic pumps and energy sources for their action. There are several papers that deal with the problems mentioned above (Doughty and Hope 1976, Gradmann 1976, Gyenes and Kurella 1980, Shiina and Tazawa 1986, Stolarek and Karcz 1987,…”

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The effects of ionic channel inhibitors and factors modifying metabolism on the excitability of the liverwort Conocephalum conicum

Trębacz

Tarnecki

Zawadzki

1989

Physiologia Plantarum

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Changes in the excitability of the liverwort Conocephalum conicum L. caused by inhibitors of ionic channels and phosphorylation uncouplers, were examined. Action potentials were triggered by electrical and light stimuli. Tetraethylammonium chloride, an inhibitor of K+ channels, completely blocked the ability to generate action potentials. Excitability also disappeared under the influence of MnCl2 and LaCl3, inhibitors of Ca2+ channels. The participation of Ca2+ and K+ in the electrogenesis of action potentials in C. conicum is discussed. Treatment with phosphorylation uncouplers induced a gradual disappearance of the metabolic component of the resting potential. It was accompanied by some series of excitations, numbering from several to over a dozen impulses characterized by decreasing amplitudes, after which the organism became totally unexcitable. Dicyclohexylcarbodiimide an inhibitor of H+‐ATPase, also caused depolarization of the transmembrane potential and disappearance of excitability. The results indicated the participation of a metabolic component in the generation of action potentials in C. conicum.

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H⁺Transport across the Plasmalemma and Tonoplast ofNitellopsis obtusaduring Excitation

1981

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Excitable Channels inNitellopsis obtusaas Part of an Active Ion-Transport System

Cited by 5 publications

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Light‐triggered action potentials in the liverwort Conocephalum conicum

Light‐triggered action potentials in the liverwort Conocephalum conicum

The effects of ionic channel inhibitors and factors modifying metabolism on the excitability of the liverwort Conocephalum conicum

H⁺Transport across the Plasmalemma and Tonoplast ofNitellopsis obtusaduring Excitation

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Excitable Channels inNitellopsis obtusaas Part of an Active Ion-Transport System

Cited by 5 publications

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Light‐triggered action potentials in the liverwort Conocephalum conicum

Light‐triggered action potentials in the liverwort Conocephalum conicum

The effects of ionic channel inhibitors and factors modifying metabolism on the excitability of the liverwort Conocephalum conicum

H+Transport across the Plasmalemma and Tonoplast ofNitellopsis obtusaduring Excitation

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H⁺Transport across the Plasmalemma and Tonoplast ofNitellopsis obtusaduring Excitation