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Guard cell pressure/aperture characteristics measured with the pressure probe |
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| Authors: | P. J. FRANKS I. R. COWAN S. D. TYERMAN A. L. CLEARY J. LLOYD G. D. FARQUHAR |
| Affiliation: | Environmental Biology Group, Research School of Biological Sciences, Australian National University, GPO Box 475, Canberra, ACT 2601, Australia;Cooperative Research Centre for Plant Science, Research School of Biological Sciences, Australian National University, GPO Box 475, Canberra, ACT 2601, Australia;Plant Cell Biology Group, Research School of Biological Sciences, Australian National University, GPO Box 475, Canberra, ACT 2601, Australia;School of Biological Sciences, The Flinders University of South Australia, PO Box 2100, South Australia 3001, Australia |
| Abstract: | Pressure within guard cells in strips of intact epidermis of Tradescantia virginiana was controlled with a pressure probe apparatus after the guard cells had been filled with silicone oil. Pressure was increased and decreased incrementally between 0.0 and 4.1 MPa to cause inflation and deflation of the guard cells. At steady-state guard cell pressures, the width of the stomatal pore was recorded and plotted against pressure. The pressure required for near-maximum aperture was 4.1 MPa. Aperture as a function of pressure was sigmoidal. |
| Keywords: | Tradescantia virginiana guard cell turgor pressure probe stomatal mechanics |