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Mechanism of the Seismonastic Reaction in Mimosa pudica

Robert D. Allen
Plant Physiology
Vol. 44, No. 8 (Aug., 1969), pp. 1101-1107
Stable URL: http://www.jstor.org/stable/4261792
Page Count: 7
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Mechanism of the Seismonastic Reaction in Mimosa pudica
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Abstract

The efflux of K+ from the pulvinar cells of Mimosa pudica was shown to increase substantially during the seismonastic reaction. This result is shown to indicate a decrease in σ (reflection coefficient) of pulvinar cell membrane for potassium salts which could account for the pulvinar cell turgor decrease during the seismonastic reaction. Membrane potentials and concentrations of Ca2+, K+, Cl-, S, and P were measured in the top and bottom halves of pulvini. Pulvinar cells showed a large negative membrane potential, cell vacuole relative to external solution, but no significant difference in membrane potential could be detected between upper and lower pulvinar cells. A large difference in K+ and Cl- concentration between top and bottom pulvinar halves was evident in reactive pulvini but not in unreactive pulvini. The effect of K+ concentration on plant growth and leaf reactivity was also investigated.

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