What is one limitation of using potato slices to measure water potential?

One limitation of using potato slices to measure water potential is that different parts of the potato may have varying water potentials. This is important to understand because the water potential is influenced by factors such as solute concentration and pressure, which can differ in various regions within the potato. For example, the outer portions of the potato might contain different concentrations of solutes compared to the inner parts, leading to discrepancies in the water potential measurements if slices are taken from these different areas. Thus, when measuring water potential, it's essential to consider that these variations can affect the accuracy and reliability of the results, ultimately leading to potential misinterpretations if not accounted for.