Hormones. Plant hormones are endogenous organic compounds active at very low concentration, produced in one tissue, and translocated to another point in the plant where their effects on growth and development are manifested. auxin (indoleacetic acid)
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Plant hormones are endogenous organic compounds active at very low concentration, produced in one tissue, and translocated to another point in the plant where their effects on growth and development are manifested.
ClassEndogenous HormoneGrowth Regulators
auxinindoleacetic acidIBA, NAA, 2,4-D, others
cytokininzeatin, zeatin ribosidekinetin, BA, 2iP, TDZ
abscisic acidabscisic acid (ABA)
Auxin (indoleacetic acid)
Produced in apical and root meristems, young leaves, seeds in developing fruits.
Auxin-like growth regulators
Commercial uses - auxins
applied as IBA, NAA, auxin-conjugates or mixes
Cytokinin (zeatin, ZR, IPA)
Produced in root meristems, young leaves, fruits, seeds.
Commercial uses - cytokinins
Applied as kinetin, benzyladenine, or zeatin conjugates
Gibberellins (1 -- 125)...
Role in many functions associated with tissue elongation and phytochrome-mediated responses.
Discovered in association with Foolish disease of rice (Gibberella fujikuroi)
Commercial uses - GA inhibitors
Cycocel, Bonsai, Sumagic
Commercial uses - GA application
Apply as GA3, or GA4+7
Gaseous hormone produced in many plant tissues.
The triple response of seedlings
Ouch! Release C2H4
Climacteric rise in ethylene and respiration during ripening of pears
Commercial uses - ethylene application
Applied as ethylene gas or Ethephon or Ethrel sprays
Commercial uses - ethylene inhibition
Removed by chemical “scrubbing” or low atmosphere
Abscisic acid (ABA.)
Found in stressed leaves, dormant seeds, dormant buds.