Abscisic acid also called stress hormone, is. responsible for bud dormancy seed dormancy abscission, leaf scnescence etc. Auxin hormone suppresses the growth of lateral buds and plays a major role in the cell elongation, bending of stem towards the light side.
Cytokinin, hormone brings about the process of cell division.
Gibberellin hormone takes part in the cell elongation in leaves and stems, parthenocarpy in fruits and in breaking of seed dormancy.