To solve this problem, we need to identify which element is responsible for maintaining turgor in cells.$\newline \bullet$Turgor pressure is the pressure exerted by the fluid inside the cell against the cell wall. It is crucial for maintaining the cell's shape and rigidity.$\newline \bullet$Potassium ions $(K_{+})$ play a significant role in maintaining turgor pressure.$\newline \bullet$Potassium is actively transported into the cell, which increases the osmotic potential inside the cell, drawing water in and thus maintaining turgor pressure.$\newline \bullet$Sodium $(Na_{+})$, Magnesium $(Mg_{2+})$, and Calcium $(Ca_{2+})$ do not primarily function in maintaining turgor pressure in plant cells.$\newline$Therefore, the element responsible for maintaining turgor in cells is Potassium.$\newline$This corresponds to Option 1: Potassium.