Auxin transport

Curr Opin Plant Biol. 2005 Oct;8(5):494-500. doi: 10.1016/j.pbi.2005.07.014.


Polar transport of auxin is essential for normal plant growth and development. On a cellular level, directional auxin transport is primarily controlled by an efflux carrier complex that is characterized by the PIN-FORMED (PIN) family of proteins. Detailed developmental studies of PIN distribution and subcellular localization have been combined with the analysis of changes in localized auxin levels to map PIN-mediated auxin movement throughout Arabidopsis tissues. Plant orthologs of mammalian multidrug-resistance/P-glycoproteins (MDR/PGPs) also function in auxin efflux. MDR/PGPs appear to stabilize efflux complexes on the plasma membrane and to function as ATP-dependent auxin transporters, with the specificity and directionality of transport being provided by interacting PIN proteins.

Publication types

  • Review

MeSH terms

  • Biological Transport
  • Carrier Proteins / physiology
  • Indoleacetic Acids / metabolism*
  • Models, Biological
  • Plant Development*
  • Plant Proteins / physiology
  • Plants / metabolism
  • Signal Transduction / physiology*


  • Carrier Proteins
  • Indoleacetic Acids
  • Plant Proteins