Question

Where is abscisic acid produced in plants?

Answer 1

Production of abscisic acid (ABA):

1. In response to reduced soil water potential (which is connected to dry soil) abscisic acid is produced.
2. In other circumstances when the plant may be stressed, abscisic acid is created in the roots.
3. Once in the leaves, ABA quickly changes the osmotic potential of the stomatal guard cells, causing them to contract and the stomata to close.
4. In times of low water supply, the ABA-induced stomatal closure prevents further water loss from the leaves by reducing transpiration (the evaporation of water out of the stomata).
5. On a leaf area basis, a strong linear association between the leaves' ABA content and their conductance (stomatal resistance) was discovered.