4-Chloroindole-3-acetic acid (4-Cl-IAA) is an organic compound that functions as a
plant hormone.[1]
Synopsis
It is a member of the class of compounds known as
auxins and a chlorinated analogue of the more common
indole-3-acetic acid (IAA) auxin. 4-Cl-IAA is found in the seeds of a variety of plants, particularly
legumes such as peas and broad beans.[2][3][4][5] In one study it is written that the substance is "mainly found in reproductive structures" and "is thought to be restricted to members of the leguminous tribe Fabeae, specifically "the genera Vicia, Pisum, Lathyrus, Lens, and Vavilovia".[6] In
Pisum sativum, 4-Cl-IAA biosynthesis diverges from IAA biosynthesis when the amino acid
tryptophan is chlorinated to form 4-chlorotryptophan (4-Cl-Trp); the biosynthesis of 4-Cl-IAA then precedes parallel to that of IAA.[7]
Engvild hypothesized in 1996 that 4-Cl-IAA may be a "death hormone" that maturing seeds use to trigger death of the parent plant by mobilizing nutrients to be stored in the seed.[8]
^Engvild, Kjeld C. (1996). "Herbicidal activity of 4-chloroindoleacetic acid and other auxins on pea, barley and mustard". Physiologia Plantarum. 96 (2): 333–337.
doi:
10.1111/j.1399-3054.1996.tb00222.x.