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Rhythmic Electrical Potential Change of Motor Pulvinus in Lateral Leaflet of Codariocalyx motorius

1989; Oxford University Press; Volume: 30; Issue: 8 Linguagem: Inglês

10.1093/oxfordjournals.pcp.a077853

1471-9053

Tamaki Mitsuno, Takao Sibaoka,

Plant Diversity and Evolution

In the leaf of Codariocalyx motorius, rhythmic electrical potential change could be recorded from the pulvinus of the lateral leaflet, which gyrates spontaneously. The change showed a complex and irregular waveform having about 3 min period with an amplitude ranging from 100 to 140 mV. On rare occassions intracellular rhythmic potential change could be recorded from a motor cell; this showed a simpler and more regular waveform than that in the former. Anoxia and application of an oxidative phosphorylation inhibitor halted the rhythmic potential change, but darkness and application of dichlorophenyl-dimethylurea did not. Vanadate poisoning stopped the change, showing that the activity of an electrogenic ion pump in the motor cell may alter rhythmically. This system utilizes ATP supplied from oxidative phosphorylation as an energy source.