Plant hormone




• promote root formation on stem and leaf cuttings

• promote shoot and bud growth

• promote setting of fruits

• prevent dropping of fruit

• produced in growing regions of plant (shoot tips, young leaves, developing seeds)

• important role in tropisms

• indoleacetic acid, IAA (natural)

• indolebutyric acid, IBA (natural and synthetic)

• naphthalene acetic acid, NAA (synthetic)

• herbicides 2,4-D and Agent Orange (synthetic)

Gibberellins (GA)

• promote elongation growth

• promote germination and seedling growth

• produced in young shoots and immature seeds

• more than 100 naturally

• gibberellic acid, GA3 (natural)

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