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Plant and Cell Physiology, 1986, Vol. 27, No. 6 953-959
© 1986

Article

Intracellular Ca2+ Concentration and Cytoplasmic Streaming in Vallisneria Mesophyll Cells

Shingo Takagi and Reiko Nagai

Department of Biology, College of General Education, Osaka University Toyonaka 560, Osaka, Japan

Intracellular Ca2+ concentration regulating the cytoplasmic streaming in Vallisneria mesophyll cells was estimated. The leaf segment was cut open at the middle of the mesophyll cell layers and the exposed mesophyll cells were treated with test solutions of various Ca2+ concentrations in the dark. This allowed A23187 [GenBank] , a calcium ionophore, to exert its full effect on the cell membrane.

The streaming was induced or maintained in solutions which contained Ca2+ at lower than 10–6M. However, Ca2+ at concentrations higher than 10–5M had a definite, inhibitory effect. The induction and cessation of streaming could be repeated by alternately changing the solutions.

(Received March 14, 1986; Accepted May 15, 1986)
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