The process by which plant cells maintain turgor pressure is primarily through the accumulation of water in the central vacuole. Turgor pressure is the pressure exerted by the fluid inside the vacuole against the cell wall, providing structural support to the plant. When a plant absorbs water, the vacuole expands, pushing against the cell wall, which keeps the plant firm and upright. This pressure is vital for maintaining the plant's shape and facilitating growth. A lack of water can lead to wilting as turgor pressure decreases.