Auxins

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Chemical Nature: Indole derivative

Physiological Activities: Cell elongation, root initiation, apical dominance

Gibberellins

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Chemical Nature: Diterpenoid acids

Physiological Activities: Stem elongation, seed germination, fruit growth

Cytokinins

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Chemical Nature: Adenine derivatives

Physiological Activities: Cell division, delay of senescence, shoot initiation

Ethylene

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Chemical Nature: Gaseous hydrocarbon

Physiological Activities: Fruit ripening, senescence, abscission

Abscisic Acid (ABA)

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Chemical Nature: Sesquiterpenoid

Physiological Activities: Stomatal closure, dormancy, stress tolerance

Brassinosteroids

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Chemical Nature: Polyhydroxysteroids

Physiological Activities: Cell expansion, vascular differentiation, stress tolerance

Salicylic Acid

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Chemical Nature: Phenolic compound

Physiological Activities: Defense signaling, flowering regulation

Jasmonates

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Chemical Nature: Fatty acid-derived

Physiological Activities: Wound response, herbivore defense, senescence

Strigolactones

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Chemical Nature: Carotenoid-derived

Physiological Activities: Inhibit shoot branching, symbiosis with mycorrhiza

Polyamines

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Chemical Nature: Aliphatic polyamines

Physiological Activities: Cell division, embryogenesis, stress tolerance