The number of K(+) channels in the plasma membrane of guard cell protoplasts changes in parallel with the surface area.

Homann U io.tu-darrmstadt.de; Thiel G

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The number of K(+) channels in the plasma membrane of guard cell protoplasts changes in parallel with the surface area.

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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.

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来源
《Proceedings of the National Academy of Sciences of the United States of America》 |2002年第15期|10215-10220|共6页
作者
Homann U io.tu-darrmstadt.de; Thiel G;
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作者单位

Institute of Botany, Technical University of Darmstadt, D-64287 Darmstadt, Germany. homann-u;

ost.cz;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
Cell Membrane; Potassium Channels; Protoplasts; 细胞膜; 钾通道; 原生生物细胞;

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The number of K(+) channels in the plasma membrane of guard cell protoplasts changes in parallel with the surface area.

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