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Auxin
Promotes stem and coleoptile elongation • Tropisms • Regulates branching • Fruit development • Root development on stem cuttings
Cytokinins
Promote cell division and differentiation • Promote axillary bud growth • Delay aging of plants
Gibberellins
Stem elongation • Fruit growth • Seed germination
Abscisic acid
Slows growth •Seed dormancy •Drought tolerance
Ethylene
Responds to mechanical stress Senescence (programmed death of cells, organs, or entire plant) • Leaf abscission • Fruit Ripening