Ways of Ion Channel Gating in Plant Cells

Król, Elżbieta; Trębacz, Kazimierz

doi:10.1006/anbo.2000.1226

Cited by 49 publications

(35 citation statements)

References 184 publications

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“…Due to the character of circumnutations, these are probably voltage-gated K + channels, inward (K + in ) channels activated with hyperpolarization, outward (K + out ) channels activated with depolarization, stretch-activated K + and Ca 2+ channels, ligand-gated K + channels, e.g., with auxins and light-activated K + channels. 49 Equally important, probably, are anion channels, which participate in the hypocotyl elongation and osmoregulation in stomatal cells, that is, processes controlled by auxins and blue light. 50 H + -ATPase and Ca 2+ , K + and Cl -channels are a part of the oscillation system in the contraction/expansion model in the motor cell of the Desmodium motorium pulvinus, proposed by Engelmann.…”

Section: Models Of Circumnutation Mechanismmentioning

confidence: 99%

Circumnutation as a visible plant action and reaction

Stolarz

2009

Plant Signaling & Behavior

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Circumnutation is a helical organ movement widespread among plants. It is variable due to a different magnitude of trajectory (amplitude) outlined by the organ tip, duration of one cycle (period), circular, elliptical, pendulum-like or irregular shape and clock-and counterclockwise direction of rotation. Some of those movement parameters are regulated by circadian clock and show daily and infradian rhythms. Circumnutation is influenced by light, temperature, chemicals and can depend on organ morphology. The diversity of this phenomenon is easier to see now that the digital time-lapse video method is developing fast. Whether circumnutation is an endogenous action, a reaction to exogenous stimuli or has a combined character has been discussed for a long time. Similarly, the relationship between growth and circumnutation is still unclear. In the mechanism of circumnutation, epidermal and endodermal cells as well as plasmodesmata, plasma membrane, ions (Ca 2+ , K + and Cl -), ion channels and the proton pump (H + ATPase) are engaged. Based on these data, the hypothetical electrophysiological model of the circumnutation mechanism has been proposed here. In the recent circumnutation studies, gravitropic, auxin, clock and phytochrome mutants are used and new functions of circumnutation in plants' life have been investigated and described.

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Section: Models Of Circumnutation Mechanismmentioning

confidence: 99%

Circumnutation as a visible plant action and reaction

Stolarz

2009

Plant Signaling & Behavior

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“…Recently, we have shown that the ultradian oscillations of the membrane potential (depolarisation and hyperpolarisation) accompany CN as well (Kurenda et al 2015). Additionally, the same ion channel and proton pump inhibitors modulating excitation in plants modulate CN as well (Millet and Badot 1996;Krol and Trebacz 2000;Krol et al 2006;Kurenda et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Spontaneous action potentials and circumnutation in Helianthus annuus

Stolarz

Dziubińska

2017

Acta Physiol Plant

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Action potentials (APs) in plants are involved in fast leaf or trap closure as well as elongation, respiration, photosynthesis, and fertilization regulation. Here, spontaneous APs (SAPs) in relation to endogenous stem movement named circumnutation (CN) have been investigated in Helianthus annuus in different light conditions in freely circumnutating and immobilized plants. Extracellular electrical measurements and time-lapse photography were carried out simultaneously. The parameters of CN (trajectory length, period, and direction) and the number and transmission direction of SAPs were analysed. In continuous light (25-40 lmol m -2 s -1), all plants circumnutating vigorously in a regular elliptical manner and no SAPs were observed. In light/dark conditions, the plants circumnutated in a daily pattern, most SAPs were observed in the dark and freely circumnutated sunflowers had two times more SAPs (10 SAPs/24 h/plant) than the immobilized plants (5 SAPs/24 h/plant). In continuous very low light (5 lmol m -2 s -1 ), the plants circumnutated weakly and irregularly and SAPs appeared without the circadian pattern. 3-5 SAPs/24/plant occurred in the freely circumnutating and immobilized plants. In light/dark and continuous very low light conditions, an ultradian rhythm of SAPs was observed and the mean spacing between SAPs was approx. 121-271 min in the freely circumnutating and immobilized plants. Under all light conditions, more SAPs were transmitted basipetally than acropetally. One-hour lasting series of 3-4 min spaced SAPs locally propagated were observed as well in very low light. Basipetal and acropetal SAPs passing along the stem motor region accompany irregularity, changes in the CN trajectory direction, and stem torsion. These results demonstrate that APs and CN changes play a role in plant adaptation to light conditions and that there is an ultradian rhythm of SAPs beside ultradian CN rhythm.

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“…[8][9][10] It activates with a multiphasic kinetics consisting of a rapid and at least one slow phase, displays a pronounced rectification allowing anions to enter but not to leave the vacuole, and is hardly affected by cytosolic Ca 2+ or ATP. We recently characterized a vacuolar anion channel in the liverwort Conocephalum 3 that shows all these characteristics of higher plant malate channels.…”

Section: Vacuolar Malate Channelmentioning

confidence: 99%