Pflügers Archiv

, Volume 439, Supplement 1, pp r152–r153

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

  • Gerhard Thiel
  • Jens-Uwe Sutter
  • Ulrike Homann
Regular article

DOI: 10.1007/s004240000127

Cite this article as:
Thiel, G., Sutter, JU. & Homann, U. Pflügers Arch (2000) 439(Suppl 1): r152. doi:10.1007/s004240000127

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+ (Cai) 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 Cai 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.

Key words Ca2+-dependent/ Ca2+-independent exocytosis Zea mays coleoptile cells capacitance membrane tension cell elongation. 

Copyright information

© Springer-Verlag 2000

Authors and Affiliations

  • Gerhard Thiel
    • 1
  • Jens-Uwe Sutter
    • 1
  • Ulrike Homann
    • 1
  1. 1.Gerhard Thiel A.v.H. Inst. Plant Sciences, Untere Karspüle2 D-37073,Göttingen.

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