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Aim: The aim of this practical is to investigate the water potential of potato tuber cells. Introduction: Water potential (Yw, psi), which is a measure of the energy state of water is affected by dissolved solutes, pressure and matrix particles. The contribution to water potential by dissolved solutes, termed osmotic potential (Ys), is always negative in sign. In other words, solutes decrease the water potential. The contribution of pressure (Yp) may be positive, negative or zero, but is generally positive since most plant cells are turgid (turgor pressure). The contribution due to the binding of water to colloidal particles (matrix) and surfaces, termed matrix potential (Ym), also lowers the water potential. Although it is often small enough to be ignored, matrix potential is important when talking about soil water relations. Thus, the water potential of a plant system can be arithmetically represented by the equation: Yw = Ys + Yp + Ym Prediction: I predict...

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