The Relationship of Stomatal Aperture and Guard-cell Turgor Pressure inVicia faba
- 1 April 1973
- journal article
- research article
- Published by Oxford University Press (OUP) in Journal of Experimental Botany
- Vol. 24 (2) , 387-399
- https://doi.org/10.1093/jxb/24.2.387
Abstract
Graded external osmotic pressures were used to examine the relationship of stomatal aperture to guard-cell turgor pressure for Vicia faba. Stomata were in floating epidermal strips and free of contact with intact epidermal cells. A number of errors were discovered in this and in the classical incipient-plasmolysis methods for measuring cell osmotic pressure. Unstirred layers in exosmosis slow equilibration markedly and rapid loss of internal solute by guard cells can occur; considerations of both water and solute fluxes and their interactions become important. However, it was possible to show that stomatal aperture under the above conditions was linearly related to guard-cell turgor pressure with a slope of 0.5 μm bar−1.Keywords
This publication has 0 references indexed in Scilit: