Molecular electronics in pinnae of Mimosa pudica.
Bioelectrochemical circuits operate in all plants including the sensitive plant Mimosa pudica Linn. The activation of biologically closed circuits with voltage gated ion channels can lead to various mechanical, hydrodynamical, physiological, biochemical, and biophysical responses. Here the biologically closed electrochemical circuit in pinnae of Mimosa pudica is analyzed using the charged capacitor method for electrostimulation at different voltages. Also the equivalent electrical scheme of electrical signal transduction inside the plant's pinna is evaluated. These circuits remain linear at small potentials not exceeding 0.5 V. At higher potentials the circuits become strongly non-linear pointing to the opening of ion channels in plant tissues. Changing the polarity of electrodes leads to a strong rectification effect and to different kinetics of a capacitor. These effects can be caused by a redistribution of K(+), Cl(-), Ca(2+), and H(+) ions through voltage gated ion channels. The electrical properties of Mimosa pudica were investigated and equivalent electrical circuits within the pinnae were proposed to explain the experimental data.
Volkov
Alexander G
AG
Department of Chemistry and Biochemistry, Oakwood University, Huntsville, AL, USA. agvolkov@yahoo.com
Foster
Justin C
JC
Markin
Vladislav S
VS
D004563:Electrochemistry; D004566:Electrodes; D007473:Ion Channels / Q000502:physiology; D031298:Mimosa / Q000502:physiology*; D018515:Plant Leaves / Q000502:physiology*; D010940:Plant Proteins / Q000502:physiology; D015398:Signal Transduction
D007473:Ion Channels; D010940:Plant Proteins
Plant Physiol. 2009 Apr;149(4):1661-7
19211696
J Biochem. 1988 Jul;104(1):5-8
3220831
Plant Physiol. 1994 Sep;106(1):165-171
12232315
Plant Signal Behav. 2007 May;2(3):139-45
19516982
Plant Cell Environ. 2010 Feb;33(2):163-73
19895396
Nature. 2000 Sep 7;407(6800):37
10993062
Plant Physiol. 1995 Jan;107(1):199-205
12228354
Bioelectrochemistry. 2009 Jun;75(2):142-7
19356999
Plant Cell Environ. 2009 Jun;32(6):606-16
19143994
Plant Physiol. 2008 Feb;146(2):694-702
18065564
Plant Cell Environ. 2007 Mar;30(3):249-257
17263772
Plant Physiol. 1975 Oct;56(4):464-7
16659326
Science. 1962 Jul 20;137(3525):226
13912476
FEBS Lett. 2007 May 25;581(12):2337-47
17434488
Biophys J. 1994 Oct;67(4):1582-93
7819490
Plant Physiol. 1973 Mar;51(3):478-80
16658355
Biofizika. 1980 Jan-Feb;25(1):144-7
7370314
J Membr Biol. 1993 Feb;131(3):179-92
7684082
Plant Cell Environ. 2010 May;33(5):816-27
20040063
C R Biol. 2005 Mar;328(3):253-62
15810549
J Membr Biol. 1995 Jul;146(2):201-9
7473689