Indole-3-acetic acid

Indole-3-acetic acid (IAA) is the most common, naturally occurring, plant hormone of the auxin class. It is the best known of the auxins, and has been the subject of extensive studies by plant physiologists. IAA is a derivative of indole, with a carboxymethyl substituent. It is a colorless solid that is soluble in polar organic solvents.

Chemistry[edit | edit source]

IAA is a derivative of indole, containing a carboxymethyl substituent. It is a colorless solid that is soluble in polar organic solvents. The molecule is derived from indole via the attachment of the acetic acid sidechain at the 3-position of the indole.

Biosynthesis[edit | edit source]

IAA is predominantly produced in cells of the apex (bud) and very young leaves of a plant. Plants can synthesize IAA by several independent biosynthetic pathways. Four of them start from tryptophan, but there is also a pathway independent of tryptophan.

Function[edit | edit source]

IAA induces cell elongation and cell division and also has a role in flower and fruit development. In particular, IAA plays a key role in the formation of roots, stems, and leaves.

References[edit | edit source]

Indole-3-acetic acid Resources
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