Thiel, Gerhard and Sutter, J. U. and Homann, Ulrike (2000):
Ca2+-sensitive and Ca2+-insensitive exocytosis in maize coleoptile protoplasts.
In: Pflügers Archiv : European journal of physiology, 439 (3 Supp), pp. R152-3. ISSN 0031-6768,
[Article]
Abstract
Ca2+ and osmotic driven extension of the surface area of maize coleoptile protoplasts was investigated using capacitance measurements and photolysis of the caged compound DM-nitrophen. Protoplasts responded to an elevation of cytoplasmic Ca2+ (Ca(i)) with a rapid burst in capacitance reaching a maximal increase of 1.3+/-1.1% over the resting cell capacitance. Subsequent lowering of the osmotic potential in the external medium by 210 mosmol caused a further increase in Cm by 26+/-6%. These data indicate two independent pathways for insertion of membrane into the plasma membrane. One is driven by Ca(i) and recruits membrane from a small pool. The osmotic evoked rise in surface area draws membrane from a much larger reservoir and may be driven by membrane tension.
| Item Type: | Article |
|---|---|
| Erschienen: | 2000 |
| Creators: | Thiel, Gerhard and Sutter, J. U. and Homann, Ulrike |
| Title: | Ca2+-sensitive and Ca2+-insensitive exocytosis in maize coleoptile protoplasts. |
| Language: | English |
| Abstract: | Ca2+ and osmotic driven extension of the surface area of maize coleoptile protoplasts was investigated using capacitance measurements and photolysis of the caged compound DM-nitrophen. Protoplasts responded to an elevation of cytoplasmic Ca2+ (Ca(i)) with a rapid burst in capacitance reaching a maximal increase of 1.3+/-1.1% over the resting cell capacitance. Subsequent lowering of the osmotic potential in the external medium by 210 mosmol caused a further increase in Cm by 26+/-6%. These data indicate two independent pathways for insertion of membrane into the plasma membrane. One is driven by Ca(i) and recruits membrane from a small pool. The osmotic evoked rise in surface area draws membrane from a much larger reservoir and may be driven by membrane tension. |
| Journal or Publication Title: | Pflügers Archiv : European journal of physiology |
| Journal volume: | 439 |
| Number: | 3 Supp |
| Divisions: | 10 Department of Biology ?? fb10_botanik ?? 10 Department of Biology > Plant Membrane Biophysics 10 Department of Biology > Plant Cell Biology |
| Date Deposited: | 22 Jun 2011 07:39 |
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