Abscisic Acid - Location and Timing of ABA Biosynthesis

Location and Timing of ABA Biosynthesis

• Released during desiccation of the vegetative tissues and when roots encounter soil compaction.
• Synthesized in green fruits at the beginning of the winter period
• Synthesized in maturing seeds, establishing dormancy
• Mobile within the leaf and can be rapidly translocated from the roots to the leaves by the transpiration stream in the xylem
• Produced in response to environmental stress, such as heat stress, water stress, salt stress
• Synthesized in all plant parts, e.g., roots, flowers, leaves and stems