Guard Cell: Difference between revisions

Guard cells are typically kidney-shaped in dicotyledons and dumbbell-shaped in monocotyledons. They are part of the stomatal complex, which also includes subsidiary cells and the stomatal pore. The cell walls of guard cells are unevenly thickened, with the inner wall facing the stomatal pore being thicker than the outer wall. This structural asymmetry is essential for their function.

Guard cells contain chloroplasts, which are relatively rare in other epidermal cells. These chloroplasts are involved in photosynthesis and play a role in the regulation of stomatal movements. The presence of chloroplasts also allows guard cells to sense changes in light intensity and quality, which can influence stomatal behavior.