TY - JOUR
T1 - Morphing structures and signal transduction in Mimosa pudica L. induced by localized thermal stress
AU - Volkov, Alexander G.
AU - O'Neal, Lawrence
AU - Volkova, Maia I.
AU - Markin, Vladislav S.
N1 - Funding Information:
This article is based upon work supported in part by the National Science Foundation under Grant No. CBET-1064160 , in part by the Russian Ministry of Education and Research (Federal Program 2012-1.5, project 8644), and in part by the U.S. Army Research Office under contract/grant number W911NF-11-1-0132 .
PY - 2013/10/15
Y1 - 2013/10/15
N2 - Leaf movements in Mimosa pudica, are in response to thermal stress, touch, and light or darkness, appear to be regulated by electrical, hydrodynamical, and chemical signal transduction. The pulvinus of the M. pudica shows elastic properties. We have found that the movements of the petiole, or pinnules, are accompanied by a change of the pulvinus morphing structures. After brief flaming of a pinna, the volume of the lower part of the pulvinus decreases and the volume of the upper part increases due to the redistribution of electrolytes between these parts of the pulvinus; as a result of these changes the petiole falls. During the relaxation of the petiole, the process goes in the opposite direction. Ion and water channel blockers, uncouplers as well as anesthetic agents diethyl ether or chloroform decrease the speed of alert wave propagation along the plant. Brief flaming of a pinna induces bidirectional propagation of electrical signal in pulvini. Transduction of electrical signals along a pulvinus induces generation of an action potential in perpendicular direction between extensor and flexor sides of a pulvinus. Inhibition of signal transduction and mechanical responses in M. pudica by volatile anesthetic agents chloroform or by blockers of voltage gated ion channels shows that the generation and propagation of electrical signals is a primary effect responsible for turgor change and propagation of an excitation. There is an electrical coupling in a pulvinus similar to the electrical synapse in the animal nerves.
AB - Leaf movements in Mimosa pudica, are in response to thermal stress, touch, and light or darkness, appear to be regulated by electrical, hydrodynamical, and chemical signal transduction. The pulvinus of the M. pudica shows elastic properties. We have found that the movements of the petiole, or pinnules, are accompanied by a change of the pulvinus morphing structures. After brief flaming of a pinna, the volume of the lower part of the pulvinus decreases and the volume of the upper part increases due to the redistribution of electrolytes between these parts of the pulvinus; as a result of these changes the petiole falls. During the relaxation of the petiole, the process goes in the opposite direction. Ion and water channel blockers, uncouplers as well as anesthetic agents diethyl ether or chloroform decrease the speed of alert wave propagation along the plant. Brief flaming of a pinna induces bidirectional propagation of electrical signal in pulvini. Transduction of electrical signals along a pulvinus induces generation of an action potential in perpendicular direction between extensor and flexor sides of a pulvinus. Inhibition of signal transduction and mechanical responses in M. pudica by volatile anesthetic agents chloroform or by blockers of voltage gated ion channels shows that the generation and propagation of electrical signals is a primary effect responsible for turgor change and propagation of an excitation. There is an electrical coupling in a pulvinus similar to the electrical synapse in the animal nerves.
KW - Electrophysiology
KW - Localized thermal stress
KW - Mimosa pudica
KW - Phloem
KW - Pulvinus
KW - Signal transduction
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U2 - 10.1016/j.jplph.2013.05.003
DO - 10.1016/j.jplph.2013.05.003
M3 - Article
C2 - 23747058
AN - SCOPUS:84882910315
SN - 0176-1617
VL - 170
SP - 1317
EP - 1327
JO - Journal of Plant Physiology
JF - Journal of Plant Physiology
IS - 15
ER -