保卫细胞原生质体质膜中钾离子通道的数量随表面积的变化而平行变化。
The number of K(+) channels in the plasma membrane of guard cell protoplasts changes in parallel with the surface area.
作者信息
Homann Ulrike, Thiel Gerhard
机构信息
Institute of Botany, Technical University of Darmstadt, D-64287 Darmstadt, Germany.
出版信息
Proc Natl Acad Sci U S A. 2002 Jul 23;99(15):10215-20. doi: 10.1073/pnas.152324399. Epub 2002 Jul 2.
Abstract
The activity of the two dominant K(+) channels in the plasma membrane of Vicia faba guard cell protoplasts was examined during pressure-driven swelling. For this purpose, the K(+) currents and the membrane capacitance (C(m)) of guard cell protoplasts were recorded in parallel. A rise in C(m), reflecting an increase of the membrane surface area, was coupled to a proportional rise in conductance of both the K(+) inward and K(+) outward rectifier. The activation kinetics of the K(+) channels were not affected during this process. The quantitative and temporal coupling of C(m) and K(+) conductance can hence be interpreted as the result of the addition of active inward and outward rectifier K(+) channels to the plasma membrane during an increase in surface area.
摘要
在压力驱动的蚕豆保卫细胞原生质体肿胀过程中，检测了质膜中两种主要钾离子通道的活性。为此，同时记录了保卫细胞原生质体的钾离子电流和膜电容（C(m)）。反映膜表面积增加的C(m)升高，与钾离子内向整流器和外向整流器的电导率成比例升高相关联。在此过程中，钾离子通道的激活动力学未受影响。因此，C(m)与钾离子电导率的定量和时间耦合，可以解释为在表面积增加期间，质膜上添加了活性内向和外向整流钾离子通道的结果。
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