Electrical tolerance of the Chara corallina plasmalemma.
[Ca2+]o controls at least three distinct electrical phenomena in the Chara plasmalemma. 1). Increase of the electrical tolerance. 2). Decrease of the G without a marked change of the Gp/Gd ratio. 3). Elevation of the threshold for excitation (data not shown). On the other hand, [Mg2+]o shows quite opposite effects. Thus, optimum [Ca2+]o and [Mg2+]o are expected in vivo. Voltage dependencies of various conductances in the Chara plasmalemma are schematically shown in Fig. 4.
Ohkawa
T
T
Department of Biology, College of General Education, Osaka University, Japan.
Tsutsui
I
I
D001693:Biological Transport, Active; D002118:Calcium / Q000494:pharmacology; D002462:Cell Membrane / Q000502:physiology; D007811:Lanthanum / Q000494:pharmacology; D008274:Magnesium / Q000494:pharmacology; D008564:Membrane Potentials; D018521:Plant Physiological Phenomena; D011522:Protons
D011522:Protons; D007811:Lanthanum; D008274:Magnesium; D002118:Calcium