Definition of Auxin

1. Noun. A plant hormone that promotes root formation and bud growth.

Generic synonyms: Growth Regulator, Phytohormone, Plant Hormone
Specialized synonyms: Iaa, Indoleacetic Acid, Indolebutyric Acid
Derivative terms: Auxinic

Definition of Auxin

1. Noun. (botany) A class of plant growth substance (often called phytohormones or plant hormones) which play an essential role in coordination of many growth and behavioral processes in the plant life cycle. ¹

¹ Source:

Definition of Auxin

1. a substance used to regulate plant growth [n -S] : AUXINIC [adj]

Medical Definition of Auxin

1. A group of plant growth substances (often called phytohormones or plant hormones), the most common example being indole acetic acid (IAA), responsible for raising the pH around cells, making the cell wall less rigid and allowing elongation. Auxins include indoleacetic acid, phenylacetic acid, and 4-chloro-indoleacetic acid. Commercially, auxins are used to promote root growth, to promote uniform flowering, and to set fruit and prevent premature fruit drop. Synthetic auxins such as 2, 4-D and 2, 4, 5-T have been used as herbicides, broad-leaved weeds like dandelions are much more susceptible to auxins than narrow-leaved plants like grass and cereal crops. The defoliant Agent Orange was a mix of 2, 4-D and 2, 4, 5-T. 2, 4-D is still in use and is thought to be safe, but 2, 4, 5-T was more or less banned by the EPA in 1979. The dioxin TCDD is an unavoidable contaminant produced in the manufacture of 2, 4, 5-T, as a result of the integral dioxin contamination, 2, 4, 5-T has been implicated in leukaemia, miscarriages, birth defects, liver damage, and other diseases. (13 Oct 1997)

Lexicographical Neighbors of Auxin

auxiliary boiler
auxiliary cell
auxiliary engine
auxiliary equipment
auxiliary language
auxiliary languages
auxiliary operation
auxiliary pump
auxiliary research submarine
auxiliary storage
auxiliary verb
auxiliary verbs
auxin (current term)

Literary usage of Auxin

Below you will find example usage of this term as found in modern and/or classical literature:

1. The Proceedings of the Iowa Academy of Science by Iowa Academy of Science (1890)
"Skoog and Thimann (1934) reported that auxin A, auxin B and ... Avery (1935) found the auxin concentration associated with differential growth in tobacco ..."

2. A Lifelong Passion: Nicholas and Alexandra: Their Own Story by Andrei Maylunas (2005)
"Maurel, C.; Brevet, J.; Barbier-Brygoo, M.; Guern, J.; Tempe, J. auxin regulates the promoter ... The tissue- specific and auxin-dependent regulation of the ..."

3. Tissue Culture: Plants : A Bibliography, January 1991-April 1993. by Henry Gilbert (1994)
"All of these lines showed alterations in auxin- induced, auxin-binding capacity (modulation), ie in the non-embryogenic lines the addition of auxin ..."

4. Gene Expression in Field Crops: Bibliography January 1991-November 1992 edited by Janet Saunders, Robert D. Warmbrodt (1995)
"In transgenic tobacco plants that have not been exposed to exogenous auxin, expression of the fusion gene is largely restricted to roots of young green ..."

5. Biotechnology: Ti-Plasmids and Other Plant Vectors: Bibliography January by Lara Wiggert (1995)
"P62 Promoters of auxin-induced genes from tobacco can lead to auxin-inducible and root tip-specific expression. Zaal, EJ van der; Droog, FNJ; Boot, CJM; ..."

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