Indole-3-acetic acid - IAA

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Plant growth regulator



Indole acetic acid (IAA) Application:

Indole-3-acetic acid (IAA, 3-IAA) is the most common, naturally occurring, plant hormone of the auxin class. It is the best known of the auxins, Natural phytohormone (plant auxin), synthesized from tryptophan, which induces plant cell elongation and division causing uncontrolled growth. Signaling molecule involved in plant organogenesis and growth control.

The discovery of IAA as a plant growth regulator coincided with the first indication of the molecular mechanisms involved in tumorigenesis induced by Agrobacterium.

Indole Acetic Acid, IAA auxin is a kind of indole broad-spectrum plant growth regulator with somatotropin activity.

In high concentrations inhibition, in small concentrations promotion of longitudinal cell growth and the related water absorption of the cells.
IAA auxin causes a fairly rapid increase in the cell wall extensibility in coleoptiles and young stems.

Chemical Name: Heteroauxin; indol-3-ylacetic acid; Indole-3-acetic acid IAA; Indole-3-acetic Acid (1.00353); Indole-3-acetic acid,(Heterauxin; Indolyl-3-acetic acid); Indole-3-acetic acid; 3-Indoleacetic acid(IAA); 3-Indoleacetic acid; IAA; IH-Indole-3-acetic acid; 3-Indole acetic acid; 3-indolylacetic acid; 1H-indol-3-ylacetate


Physical and Chemical Properties:

Appearance: White-like crystal

Empirical Formula: C10H9NO2

Molecular Weight: 175.19


Indole acetic acid (IAA) effects::

- Promotion of cell division of the meristematic tissue.

- Promotion of root formation even on tissues which do normally form roots,but inhibition of growth, except in smallest concentrations.

- Promotion of callus formation and callus.

- Inhibition of budding and growth of auxiliary buds and bud formation.

- Influencing of leaf, flower and fruit shedding.

- Influencing of flower formation

- Formation of parthenocarpic fruit (seedless fruit).

- Promotion of respiration and protein formation.


IAA Recommended dosage:

Up to 80 g a.i/ha per application, depending on desired effect.



Technical: 98% TC

More info and storage condition

Indole-3-acetic acid GA3-cas-77-06-5



CAS Number: 87-51-4



IAA plant hormone instructions


More information:

  • CAS Number: 77-06-5

  • Formula: C10H9NO2

  • Molar Mass: 175.19 g·mol−1