Guard Cells
Guard cells are specialized cells that occur in pairs and form the outer layer of stomata, which are small pores in the epidermis of most plants. They are responsible for regulating the intake and outflow of gases and water vapor from the plant, thereby playing a crucial role in water balance and photosynthetic efficiency. They also help to protect the plant from pathogens by closing the stomata when the plant is in danger. Guard cells are unique among plant cells in their ability to absorb and lose water quickly, allowing them to swell and shrink in response to environmental conditions, such as light, temperature, and humidity. This change in shape of the guard cells causes the stomata to open or close, thereby controlling the exchange of gases between the plant and the environment. Guard cells are therefore essential for the survival of plants, as they help to maintain a healthy environment for photosynthesis and other vital processes.
← Journal of Plant Cell Development