auxin
Auxin (English auxin) is a group of plant hormones that mainly promotes plant growth (elongation growth). Indole-3-acetic acid (IAA) exists most abundantly as a naturally occurring auxin, and indole-3-butyric acid (IBA) is also contained in corn and others. Examples of synthetic auxins include naphthaleneacetic acid, naphthoxyacetic acid, phenylacetic acid, 2,4-dichlorophenoxyacetic acid (2,4-D), 2,4,5-trichlorophenoxyacetic acid (2,4,5-T) and the like. There is gibberellin in the plant hormone which promotes the growth of the plant as well, but since it works differently from auxin, the substance classified as gibberellin is not included in auxin. Went suggested the presence of substances that promote the growth of stems during chewing studies, and the structure was determined by Cagle et al. To be indole-3-acetic acid. It is the plant hormone that was first discovered. ...