4.4.6: Summary Table — Read — Invisible Network

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Table \(\PageIndex{1}\): Summary of the sources, transport mechanism, and major actions of the five main plant hormones
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

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Melissa Ha (CC-BY-NC)

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