Action potential and rapid movement in the main pulvinus ofMimosa pudica

  • Kenji Oda
  • Takeshi Abe


Relationships between action potential and rapid bending movement in the main pulvinus ofMimosa pudica L. were studied. The pulvinar action potential consisted of a fast-rising spike of 40 to 70 mV and a long-lasting plateau. It had a nature of propagating in both basipetal and acropetal directions at the rate of about 4 cm/sec. The rapid bending movement occurred 10 to 20 msec after the pulvinar action potential. The action potential and movement were both found only in the lower half of the main pulvinus, no response being observed in the upper half. The results suggested that the excitable cells which elicit the action potential as well as the rapid contraction exist only in the lower half of the pulvinus. Some possible mechanisms concerning the coupling between the electrical excitation and the contraction are discussed.


Ouabain Lower Half Cortex Cell Excitable Cell Heat Stimulus 
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Copyright information

© The Botanical Society of Japan 1972

Authors and Affiliations

  • Kenji Oda
    • 1
  • Takeshi Abe
    • 1
  1. 1.Biological LaboratoryFukushima UniversityFukushima

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