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Ca2+-sensitive and Ca2+-insensitive exocytosis in maize coleoptile protoplasts.

Thiel, Gerhard ; Sutter, J. U. ; Homann, Ulrike (2000)
Ca2+-sensitive and Ca2+-insensitive exocytosis in maize coleoptile protoplasts.
In: Pflügers Archiv : European journal of physiology, 439 (3 Supp)
Artikel, Bibliographie

Kurzbeschreibung (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.

Typ des Eintrags: Artikel
Erschienen: 2000
Autor(en): Thiel, Gerhard ; Sutter, J. U. ; Homann, Ulrike
Art des Eintrags: Bibliographie
Titel: Ca2+-sensitive and Ca2+-insensitive exocytosis in maize coleoptile protoplasts.
Sprache: Englisch
Publikationsjahr: 2000
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Pflügers Archiv : European journal of physiology
Jahrgang/Volume einer Zeitschrift: 439
(Heft-)Nummer: 3 Supp
Kurzbeschreibung (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.

Fachbereich(e)/-gebiet(e): 10 Fachbereich Biologie
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10 Fachbereich Biologie > Plant Membrane Biophyscis (am 20.12.23 umbenannt in Biologie der Algen und Protozoen)
10 Fachbereich Biologie > Pflanzliche Zellbiologie
Hinterlegungsdatum: 22 Jun 2011 07:39
Letzte Änderung: 05 Mär 2013 09:49
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