Pěnčík A, Simonovik B, Petersson SV, Henyková E, Simon S, Greenham K, Zhang Y, Kowalczyk M, Estelle M, Zažímalová E, Novák O, Sandberg G, Ljung K
PLANT CELL
25:
3858–3870,
2013
Keywords:
Auxin metabolism, auxin signalling, auxin transport, BY-2
Abstract:
The native auxin, indole-3-acetic acid (IAA), is a major regulator of plant growth and development. Its nonuniform distribution
between cells and tissues underlies the spatiotemporal coordination of many developmental events and responses to
environmental stimuli. The regulation of auxin gradients and the formation of auxin maxima/minima most likely involve the
regulation of both metabolic and transport processes. In this article, we have demonstrated that 2-oxindole-3-acetic acid
(oxIAA) is a major primary IAA catabolite formed in Arabidopsis thaliana root tissues. OxIAA had little biological activity and
was formed rapidly and irreversibly in response to increases in auxin levels. We further showed that there is cell type–specific
regulation of oxIAA levels in the Arabidopsis root apex. We propose that oxIAA is an important element in the regulation of
output from auxin gradients and, therefore, in the regulation of auxin homeostasis and response mechanisms.
Fulltext: contact IEB authors
IEB authors: Ondřej Novák,
Eva Zažímalová
Čeština
English