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Determination of the water potential of root/tuber cells by the weighing method Introduction When a plant cell is bathed in a solution of the same water potential, its mass and volume remain the same, because water enters ad leaves at the same rate. If samples of tissue are immersed in a range of solutions of different concentrations (molarities), the cells will gain water by a method known as osmosis and therefore, mass, in solutions of higher water potential and lose water and mass in solutions of lower water potential. The water potential of the tissue is equal to that of the solution in which it neither gains nor loses mass. The purpose of this practical is to estimate the water potential of the potato tuber cells by this method. In practice, none of the experimental solutions is likely to have exactly the same water potential as the cells but the solution in which there...

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