Indole-3-acetic acid (IAA)

Definition - What does Indole-3-acetic acid (IAA) mean?

Indole-3-acetic acid refers to a naturally occurring auxin which is produced in a plant’s roots and shoots. Like most auxins, indole-3-acetic acid encourages cell division and elongation, which has a significant impact on the plant’s development and growth. This auxin also regulates the plant’s genes. Plants produce indole-3-acetic acid from tryptophan.

MaximumYield explains Indole-3-acetic acid (IAA)

The most important functions of indole-3-acetic acid are the abscission of fruit and leaves, leaf senescence as well as the ripening and flowering of leaves. Additionally, this molecule also regulates the plant’s phototropic and gravitropic response while ensuring root initiation, vascular tissue differentiation, cell expansion as well as cell division. Indole-3-acetic acid has also been known to increase the growth of the plant’s main stem while breaking down apical dominance. Because it regulates cell permeability, the hormone can even improve the efficiency of Bradyrhizobium spp and Rhizobium.

Synthetized by certain types of microbes and plants, this molecule can also attract fungi in some cases.


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