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Plants have hormones, just as animals do. Plant hormones, however, are chemically quite different from animal hormones. Most are small molecules, while animal hormones are often very large molecules, such as steroids or proteins. Plant hormones fall into several different categories:

Auxins -- growth stimulating hormones

Produced by apical meristems (primary growing tips) to suppress growth by lateral meristems (secondary growth buds)

I.e., these hormones repress branching

Stimulate root growth. These are the active ingredients in rooting preparations used by horticulturists and gardeners

Indolebutyric acid

Indoleacetic acid

alpha-Naphthylene acetic acid -- a synthetic auxin

2,4-D herbicides -- super-auxins

 

Kinetins -- growth stimulating hormones

Antagonize the effects of auxins

Stimulate the growth of secondary branches

Kinetin

Benzyl-amine purine (BAP) -- a synthetic kinetin

 

Abscisic acid (ABA)

Stress response mediator

Dormancy initiator

 

Ethylene

A gas, CH₂=CH₂

Stimulates ripening

 

Giberellic acid (GA)

Cell elongation stimulator

Dormancy terminator, so used by horticulturists to stimulate seeds to germinate

 

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