It is suggested that turgor pressure sensing in plant cells occurs via compression of the cell membranes; either at the plasmalemma where a pressure gradient exists, or the tonoplast due to the pressure developed inside the cell. Considerations of electro-mechanical forces in electrical breakdown of cells suggests that significant changes in the thickness of some regions of the membrane can indeed occur. It is readily envisaged how such changes in membrane thickness can be coupled to changes in active transport processes.