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Meaning of AUXIN

Pronunciation:  'oksin

WordNet Dictionary
[n]  a plant hormone that promotes root formation and bud growth

AUXIN is a 5 letter word that starts with A.


 See Also: growth regulator, IAA, indoleacetic acid, indolebutyric acid, phytohormone, plant hormone



Biology Dictionary
 Definition: One of several hormones that plays a role in many aspects of plant growth and development. 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 the integral dioxin contamination, 2,4,5-T has been implicated in leukemia, miscarriages, birth defects, liver damage, and other diseases.