4.4.6: Summary Table
- Page ID
- 50922
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| Hormone | Source(s) | Transport mechanism | Major actions |
|---|---|---|---|
| Auxin | Apical meristems, young leaves, and developing seeds | Polar transport or nonpolar transport through the phloem | Tropisms, embryo and leaf development, root initiation, apical dominance, flowering and fruit development, prevention of abscission |
| Cytokinins | Root tips and other young tissues | Xylem | Gravitropism, cell division, germination, leaf formation, inhibition of apical dominance, inhibition of root initiation |
| Gibberellins | Young shoot tissues and seeds | Likely vascular tissue | Germination, shoot elongation, bolting, flowering, production of male flowers, fruit maturation |
| Ethylene | Stressed, wilting, or ripening tissues | Moves through the air as a gas | Abscission, senescence, fruit ripening, triple response, production of female flowers |
| Abscisic acid | Mature leaves and roots | Vascular tissue | Seed maturation and inhibition of germination, bud dormancy, stomatal closure |
Attribution
Melissa Ha (CC-BY-NC)