Abscisic Acid
It is a hormone that inhibits growth. GAs are counterbalanced by ABAs. It promotes dormancy and abscission by inhibiting plant metabolism. Because it raises plants’ stress tolerance, it is also known as “stress hormone.” Abscisic acid (ABA).
Functions of Abscisic acid:
(i)causes leaves and fruits to fall off
(ii) inhibits the germination of seeds
(iii) induces leaves to senesce
(iv ) accelerates dormancy in seeds, which is useful for storage.
(v) stimulates stomatal closure to prevent transpiration when there is a lack of water.