Regulation of auxin transport polarity by AGC kinases

Curr Opin Plant Biol. 2008 Oct;11(5):495-502. doi: 10.1016/j.pbi.2008.06.004. Epub 2008 Jul 18.


The plant hormone auxin controls plant development through gradients and maxima that are generated by PIN efflux carrier driven polar auxin transport. PIN proteins direct this cell-to-cell auxin transport, and thus orient plant development through their asymmetric subcellular distribution. PIN polarity is regulated by PINOID and the phototropins, members of the AGC protein serine/threonine kinase family. Here we review the signaling pathways of these kinases and the role of calcium and BTB proteins in translating both internal and external signals into developmental responses via PIN relocalization, to adapt plant development to changing environmental conditions.

Publication types

  • Review

MeSH terms

  • Arabidopsis / cytology
  • Arabidopsis / growth & development
  • Arabidopsis / metabolism*
  • Arabidopsis Proteins / metabolism
  • Arabidopsis Proteins / physiology*
  • Biological Transport
  • Calcium / physiology
  • Indoleacetic Acids / metabolism*
  • Membrane Transport Proteins / metabolism
  • Membrane Transport Proteins / physiology*
  • Models, Biological
  • Protein-Serine-Threonine Kinases / metabolism
  • Protein-Serine-Threonine Kinases / physiology*
  • Signal Transduction / physiology*
  • Tropism


  • Arabidopsis Proteins
  • Indoleacetic Acids
  • Membrane Transport Proteins
  • Protein-Serine-Threonine Kinases
  • Calcium