* Leaves: ABA is produced in the mesophyll cells of leaves, especially during times of stress like drought or high salinity.
* Roots: Roots are also significant sites of ABA production. They sense soil water potential and release ABA into the xylem, which is then transported to the leaves.
* Developing Seeds: ABA plays a crucial role in seed maturation and dormancy, and it is synthesized within the developing seeds themselves.
Other locations where ABA can be produced:
* Fruits: ABA contributes to fruit ripening and abscission (shedding).
* Stems: ABA is involved in stem growth regulation.
It's important to note that while ABA can be produced in various plant tissues, the amount and location of synthesis can vary depending on the species, developmental stage, and environmental conditions.
