Review

Planta

, Volume 227, Issue 5, pp 929-941

First online:

Auxin dynamics: the dazzling complexity of a small molecule’s message

  • Carolin DelkerAffiliated withIndependent Junior Research Group, Leibniz Institute of Plant Biochemistry
  • , Anja RaschkeAffiliated withIndependent Junior Research Group, Leibniz Institute of Plant Biochemistry
  • , Marcel QuintAffiliated withIndependent Junior Research Group, Leibniz Institute of Plant Biochemistry Email author 

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Abstract

The phytohormone auxin is a potent regulator of plant development. Since its discovery in the beginning of the twentieth century many aspects of auxin biology have been extensively studied, ranging from biosynthesis and metabolism to the elucidation of molecular components of downstream signaling. With the identification of the F-box protein TIR1 as an auxin receptor a major breakthrough in understanding auxin signaling has been achieved and recent modeling approaches have shed light on the putative mechanisms underlying the establishment of auxin gradients and maxima essential for many auxin-regulated processes. Here, we review these and other recent advances in unraveling the entanglement of biosynthesis, polar transport and cellular signaling events that allow small auxinic molecules to facilitate their complex regulatory action.

Keywords

Auxin signaling IAA Polar auxin transport TIR1 Natural variation