If the ψ of air around a tree is -14 MPa, the ψ inside the stomata...
If the ψ of air around a tree is -14 MPa, the ψ inside the stomata is -7 MPa, and the ψ of the xylem in the leaf is -5 MPa, will transpiration occur? Why or why not?
Homework Answers
The water movement occur from high water potential to lower potential.
Now the water potential in the stomata is -7 and water potential in xylem is -5. It means water movement occurs from xylem to stomata.
Now water potential in air is -14MPa
It means water movement do not occur from stomata to outside the leaf. Because water potential is higher around air (-14) where as water potential in stomata of leaf (-5) is lower. As we know that loss of water in the form of water vapour from leaf to air is known as transpiration. That's why there is no transpiration occur.
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