Signal transduction in<i>Mimosa pudica</i>: biologically closed electrical circuits

Volkov, Alexander G.; Foster, Justin C.; Markin, Vladislav S.

doi:10.1111/j.1365-3040.2010.02108.x

Cited by 9 publications

(21 citation statements)

References 55 publications

(34 reference statements)

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“…We analyzed, both experimentally and theoretically, the mechanism of mechanical movements in Mimosa pudica induced by low voltage electrostimulation of the petiole and pinna. 35,36 The charged capacitor method is a very efficient tool for the study of the bioelectrochemistry of cells, clusters of cells or for electrostimulation of whole plants and evaluation of biologically closed electrical circuits.…”

Section: Resultsmentioning

confidence: 99%

“…A short time ago, we discovered the bioelectrochemical mechanisms of electrical signal transduction in biologically closed electrical circuits in the pinnae and petioles of Mimosa pudica and the plant's responses to electrostimulation. 35,36 The studies of the mechanisms of concerted movements in plants from electrical signal transduction to cascades of cellular events will have a potentially broad impact on both fundamental sciences and engineering. 37,38 When describing the propagation of electrical signals in plants, it is often convenient to represent the real electrical and electrochemical properties of biointerfaces with idealized equivalent electrical circuit models consisting of discrete electrical components.…”

Section: Mechanical and Electrical Anisotropymentioning

confidence: 99%

“…43,44 The activation of such circuits can lead to various physiological and biophysical responses. [35][36][37]45 Recently, we investigated the biologically closed electrical circuits potential activates voltage gated channels and induces the redistribution of K + , Cl -, H + and Ca 2+ ions between extensor and flexor layers which in turn leads to the osmotic movement of water, causing the bending of the pulvinus and movement of the petiole in Mimosa pudica. 8,[20][21][22][29][30][31] The potassium concentration in the apoplast of extensor cells of the Mimosa pudica's pulvinus increases from 30-70 mM to 100 mM.…”

Section: Mechanical and Electrical Anisotropymentioning

confidence: 99%

“…The equivalent electrical circuit is passive and consists of resistors and capacitors. 36 Application of a high voltage of 9 V induces the petiole movement. 14 Electrical anisotropy of a pulvinus.…”

Section: Andmentioning

confidence: 99%

“…This parameter is often analyzed in electrical impedance spectroscopy studies of biological tissues. 36,39,42 Figure 12A presents the time dependence of the input resistance for initial voltage of 1 V with the electrodes placed across the pulvinus. This dependence is perfectly modelled by the circuit in Figure 9C.…”

Section: Andmentioning

confidence: 99%

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Mechanical and electrical anisotropy inMimosa pudicapulvini

Volkov

Foster²,

Baker³

et al. 2010

Plant Signaling & Behavior

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Thigmonastic or seismonastic movements in Mimosa pudica, such as the response to touch, appear to be regulated by electrical, hydrodynamical, and chemical signal transduction. The pulvinus of Mimosa pudica shows elastic properties, and we found that electrically or mechanically induced movements of the petiole were accompanied by a change of the pulvinus shape. As the petiole falls, the volume of the lower part of the pulvinus decreases and the volume of the upper part increases due to the redistribution of water between the upper and lower parts of the pulvinus. This hydroelastic process is reversible. During the relaxation of the petiole, the volume of the lower part of the pulvinus increases and the volume of the upper part decreases. Redistribution of ions between the upper and lower parts of a pulvinus causes fast transport of water through aquaporins and causes a fast change in the volume of the motor cells. Here, the biologically closed electrochemical circuits in electrically and mechanically anisotropic pulvini of Mimosa pudica are analyzed using the charged capacitor method for electrostimulation at different voltages. Changing the polarity of electrodes leads to a strong rectification effect in a pulvinus and to different kinetics of a capacitor discharge if the applied initial voltage is 0.5 V or higher. The electrical properties of Mimosa pudica's pulvini were investigated and the equivalent electrical circuit within the pulvinus was proposed to explain the experimental data. The detailed mechanism of seismonastic movements in Mimosa pudica is discussed.

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Section: Resultsmentioning

confidence: 99%

Section: Mechanical and Electrical Anisotropymentioning

confidence: 99%

Section: Mechanical and Electrical Anisotropymentioning

confidence: 99%

Section: Andmentioning

confidence: 99%

Section: Andmentioning

confidence: 99%

See 3 more Smart Citations

Mechanical and electrical anisotropy inMimosa pudicapulvini

Volkov

Foster²,

Baker³

et al. 2010

Plant Signaling & Behavior

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X‐ray CT and histological imaging of xylem vessels organization in Mimosa pudica

Lee¹,

Song

Kim

et al. 2013

Microscopy Res & Technique

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Mimosa pudica has three distinct specialized organs, namely, pulvinus, secondary pulvinus, and pulvinule, which are respectively controlling the movements of petioles, leaflets, and pinna in response to external stimuli. Water flow is a key factor for such movements, but detailed studies on the organization of the vascular system for water transport in these organs have not been published yet. In this study, organizations of the xylem vessels and morphological features of the pulvinus, the secondary pulvinus, and the pulvinule were experimentally investigated by X-ray computed tomography and histological technique. Results showed that the xylem vessels were circularly distributed in the specialized motile organs and reorganized into distinct vascular bundles at the extremities. The number and the total cross-sectional area of the xylem vessels were increased inside the specialized motile organs. Morphological characteristics obtained in this study provided new insight to understand the functions of the vascular networks in the dynamic movements of M. pudica.

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Reversely Orthogonal Actuation of a Janus-Faced Film Based on Asymmetric Polymer Brush Modification

Xiang

Zhang

et al. 2019

ACS Appl. Mater. Interfaces

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The actuation phenomena of materials upon external stimulus have attracted much attention for the development of excellent sensors and devices. Herein, we present a smart Janus-faced film that exhibits novel behavior of reverse orthogonal actuation under high humidity and a positive actuation under low humidity, which is achieved by asymmetric polymer brushes on polydimethysiloxane as a substrate through surface-initiated atom transfer radical polymerization. The classical theory of plates and shells and finite element simulations are also applied to understand the orthogonal actuation mechanism of the actuator. This Janus-faced film can reversely grab objects rapidly under high humidity, which provides significant potential to design a more intelligent actuator. In addition, this film is highly sensitive to humidity that even the approaching finger can make it to bend, which is just like the actuation behavior of Mimosa pudica. Based on the above phenomena, we also design the sensing devices to realize the detection of humidity. Interestingly, the film intelligently identifies different solvents (e.g., water and ethanol). This work may demonstrate significant potential in smart surface modifications, flexible robots, bionic sensors, and other fields.

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Signal transduction inMimosa pudica: biologically closed electrical circuits

Cited by 9 publications

References 55 publications

Mechanical and electrical anisotropy inMimosa pudicapulvini

Mechanical and electrical anisotropy inMimosa pudicapulvini

X‐ray CT and histological imaging of xylem vessels organization in Mimosa pudica

Reversely Orthogonal Actuation of a Janus-Faced Film Based on Asymmetric Polymer Brush Modification

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