Auxin Signaling

Several processes are known to occur within a few minutes after auxin application to plant tissues. These vary from rapid changes in enzymatic activities

(Morre et al. 2003; Droog et al. 1995; Bilang and Sturm 1995) and gene expression (Theologis 1986; Guilfoyle 1986; Abel and Theologis 1996) to changes in transporter activities, leading to acidification of the cell wall (Grebe 2005), and a rapid increase in the membrane potential (Karcz and Burdach 2002) or the cytosolic calcium levels (Gehring et al. 1990). For most of these primary responses the signaling pathways are yet unknown, but in the last few years the events leading to auxin responsive gene expression have been uncovered.

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