Tags: Chemical Compound, Chemical Substance.
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. Chemically IAA is a carboxylic acid in which the carboxyl group is attached through a methylene group to the C-3 position of an indole ring. In appearance IAA is a colorless solid.
