Membrane Potentials and Resistances of Excitable Cells in the Petiole and Main Pulvinus of Mimosa pudica

Intracellular recordings of cultured mouse thioglycolate-induced peritoneal exudate macrophages reveal that these cells can exhibit two different types of electrophysiological properties characterized by differences in their current-voltage relationships and their resting membrane potentials. The majority of cells had low resting membrane potentials (-20 to -40 mV) and displayed current-voltage relationships that were linear for inward-going current pulses and rectifying for outward-going pulses. Small depolarizing transients, occurring either spontaneously or induced by current pulses, were seen in some cells with low resting membrane potentials. A second smaller group of cells exhibited more hyperpolarized resting membrane potentials (-60 to -90 mV) and S-shaped current-voltage relationships associated with a high-resistance transitional region. Cells with S-shaped current-voltage relationships sometimes exhibited two stable states of membrane potential on either side of the high-resistance transitional region. These data indicate that macrophages exhibit complex electrophysiological properties often associated with excitable cells.

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Comparative Histocytology of the Petiole and the Main Pulvinus in Mimosa pudica L.

Annals of Botany ◽

10.1093/oxfordjournals.aob.a086348 ◽

1982 ◽

Vol 50 (1) ◽

pp. 83-92 ◽

Cited By ~ 23

Author(s):

P. FLEURAT-LESSARD ◽

G. ROBLIN

Keyword(s):

Mimosa Pudica ◽

Main Pulvinus

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Design concept of a new bio-inspired tactile sensor based on main pulvinus motor organ cells distribution of Mimosa Pudica plant

2014 International Symposium on Micro-NanoMechatronics and Human Science (MHS) ◽

10.1109/mhs.2014.7006091 ◽

2014 ◽

Cited By ~ 1

Author(s):

Siti Nora Basir ◽

Hanafiah Yussof ◽

Nur Ismarrubie Zahari ◽

Fahrulrodzi Idris

Keyword(s):

Tactile Sensor ◽

Design Concept ◽

Mimosa Pudica ◽

Main Pulvinus

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Resting and action potentials of excitabl cells in the main pulvinus of Mimosa pudica

Plant and Cell Physiology ◽

10.1093/oxfordjournals.pcp.a075397 ◽

1976 ◽

Keyword(s):

Action Potentials ◽

Mimosa Pudica ◽

Main Pulvinus

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Adaptive anatomical structure for nastic movement in Mimosa pudica L.

Bangladesh Journal of Botany ◽

10.3329/bjb.v42i1.15876 ◽

2013 ◽

Vol 42 (1) ◽

pp. 131-138

Author(s):

Ming-Lin Chen ◽

Wen-Bin Mao ◽

Mei-Chen Cui

Keyword(s):

Anatomical Structure ◽

Mimosa Pudica ◽

Anatomical Structures ◽

Albizia Julibrissin ◽

Cortical Parenchyma ◽

Parenchyma Cells ◽

Protoplast Volume ◽

Main Pulvinus

In order to study the adaptive anatomical structures during nastic movement of Mimosa pudica L., anatomical structures of main pulvinus, common petioles, rachis and leaflets were compared with Albizia julibrissin Durazz. (taken as control). The anatomical structures of main pulvinus and common petiole of M. pudica were different from that of A. julibrissin. Upon stimuliti, the protoplast volume of M. pudica in the lower cortical parenchyma cells become smaller than that in upper ones, a feature seldom found in A. julibrissin. There were found many reticulate lacunas on the two side of adaxial petiole of M. pudica, but nil in A. julibrissin. Similarly some ill developed lacunas were found in the pulvinus of rachis and leaflet of M. pudica, but absent in A. julibrissin. It appears that reticulate lacunas in common petiole of M. pudica are responsible for its strong nastic movement. The main sensitivity position lies at the base of common petiole, where the lower cortex is more sensitive than the upper cortex, and the ordinal sensitivity positions are rachis and leaflets. DOI: http://dx.doi.org/10.3329/bjb.v42i1.15876 Bangladesh J. Bot. 42(1): 131-137, 2013 (June)

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