An Instrument for Non-Destructive Measurement of the Pressure Potential (Turgor) of Leaf Cells

Abstract
An instrument is described which permits the non-destructive measurement of the mean pressure potential (turgor)of leaf lamina cells. Calibration shows that the instrument gives a voltage output which is linearly related to mean pressure potential of living leaf cells as determined with a pressure chamber. Measurements may be made very quickly in the field or controlled environment with a resolution of at least 50 k Pa.