Stomate (Plant Anatomy)

 

 

Stomate (+ Video)

Encyclopaedia Britannica –

“Editors of Encyclopædia Britannica”

Video : Microphotography and animation of stomate function

Encyclopædia Britannica, Inc.

 

https://www.britannica.com/science/stomate

A stomate opens and closes in response to the internal pressure of two sausage-shaped guard cells that surround it. The inner wall of a guard cell is thicker than the outer wall. When the guard cell is filled with water and it becomes turgid, the outer wall balloons outward, drawing the inner wall with it and causing the stomate to enlarge.

Guard cells work to control excessive water loss, closing on hot, dry, or windy days and opening when conditions are more favourable for gas exchange. At dawn a sudden increase in stomatal opening, reaching maximum near noon, is followed by a decline because of water loss. Recovery and reopening are then followed by another decline as darkness approaches.

The concentration of carbon dioxide in the air is another regulator of stomatal opening in many plants. When carbon dioxide levels fall below normal (about 0.03 percent), the guard cells become turgid and the stomata enlarge.