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Biophysical Journal 63: 864-867 (1992)
© 1992 the Biophysical Society

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Cytoplasmic calcium stimulates exocytosis in a plant secretory cell

Mark Tester *

Robert Zorec 

Institute of Pathophysiology, University of Ljubljana, 61105, Slovenia
Department of Botany, University of Adelaide, SA 5000, Australia

ABSTRACT

Although exocytosis is likely to occur in plant cells, the control of this process is the subject of speculation, as no direct measurements of vesicle fusion to the plasma membrane have been made. We used the patch clamp technique to monitor the secretory activity of single aleurone protoplasts by measuring membrane capacitance (Cm), while dialyzing the cytosol with different Ca2+ containing solutions. Secretory activity increased with [Ca2+]i ~ 1 µM. This demonstrates directly the existence of exocytosis in plant cells, and suggests that both plant and animal cells share common mechanisms (cytosolic Ca2+) for the control of exocytotic secretion.




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Copyright © 1992 by the Biophysical Society.