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Unitary exocytotic and endocytotic events in guard-cell protoplasts during osmotically driven volume changes.

Homann, Ulrike and Thiel, Gerhard (1999):
Unitary exocytotic and endocytotic events in guard-cell protoplasts during osmotically driven volume changes.
In: FEBS letters, pp. 495-9, 460, (3), ISSN 0014-5793, [Article]

Abstract

Osmotically driven swelling and shrinking of guard-cell protoplasts (GCPs) requires adjustment of surface area which is achieved by addition and removal of plasma membrane material. To investigate the mechanism for adaptation of surface area we have used patch-clamp capacitance measurements. The recorded membrane capacitance (C(m)) trace of swelling and shrinking GCPs occasionally revealed discrete upward and downward deflecting capacitance steps, respectively, with a median value of about 2 fF. The observed capacitance steps resulted from the fusion and fission of single vesicles with a diameter of around 300 nm. We conclude that exo- and endocytosis of these vesicles accommodate for osmotically driven surface area changes in GCPs.

Item Type: Article
Erschienen: 1999
Creators: Homann, Ulrike and Thiel, Gerhard
Title: Unitary exocytotic and endocytotic events in guard-cell protoplasts during osmotically driven volume changes.
Language: English
Abstract:

Osmotically driven swelling and shrinking of guard-cell protoplasts (GCPs) requires adjustment of surface area which is achieved by addition and removal of plasma membrane material. To investigate the mechanism for adaptation of surface area we have used patch-clamp capacitance measurements. The recorded membrane capacitance (C(m)) trace of swelling and shrinking GCPs occasionally revealed discrete upward and downward deflecting capacitance steps, respectively, with a median value of about 2 fF. The observed capacitance steps resulted from the fusion and fission of single vesicles with a diameter of around 300 nm. We conclude that exo- and endocytosis of these vesicles accommodate for osmotically driven surface area changes in GCPs.

Journal or Publication Title: FEBS letters
Volume: 460
Number: 3
Divisions: 10 Department of Biology
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10 Department of Biology > Plant Membrane Biophysics
10 Department of Biology > Plant Cell Biology
Date Deposited: 22 Jun 2011 07:42
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