Botany Plant Hormones

Auxin's source

seeds, apical meristems, young leaves

Example of an Auxin

indole-3-acetic acid (IAA)

Auxin's function

stimulates stem elongation, root growth, differentiation, branching, development of fruit; responses to light, gravity

Cytokinins source

roots, transported through xylem

Example of Cytokinin

Kinetin

Cytokinin's function

affect root growth, cell division, growth, germination, flowering, delays senescence

Gibberellins source

Meristems, actively dividing regions

Example of Gibberellin

Gibberellic Acid (GA3)

Gibberellins function

promotes seed germination; bud, stem, leaf growth; flowering, fruiting, root growth and differentiation

Abscisic Acid source

leaves, stems, green fruits

Example of Abscisic Acid

Abscisic Acid (ABA)

Abscisic Acid's function

inhibits growth, promotes senescence, closes stomata in water stress maintains dormancy

Ethylene source

senescent leaves, ripe fruits, stem nodes

Ethylene example

Ethylene

Ethylene's function

promotes senescence, fruit ripening, opposes auxin activity, inhibits growth

Brassinosteroid's source

Pollen, grains, apices

Brassinosteroids example

Brassinolide

Brassinosteroid's function

Promotes pollen tube, stem growth, delays leaf fall, stimulates ethylene production