Auxin is one of the major five plant hormones, mostly present natively as free or conjugated indole-acetic acid (IAA), a tryptophan derivative. Polar auxin transport is tightly regulated, and the hormone has a cardinal role in almost all important processes of a plant's life cycle, such as shoot and root growth, development, cell expansion and division, flowering, fruit maturing, organ patterning, and stress responses.

Latest Research and Reviews

News and Comment

  • News and Views |

    The canonical auxin receptor complex mediates gene expression, but it is also necessary for responses far too rapid to be mediated by transcription. An innovative setup that uses advanced microscopy and microfluidics can record auxin-induced changes within 30 seconds during root growth.

    • Katarzyna Retzer
    • , Gaurav Singh
    •  & Richard M. Napier
    Nature Plants 4, 410-411
  • News and Views |

    A genetic screen in the model panicoid grass Setaria viridis reveals the importance of the auxin transporter AUX1 for inflorescence branching in maize, highlighting how model plants can accelerate gene discovery in complex crops.

    • Richard Sibout
    Nature Plants 3, 17060
  • News and Views |

    Plants must adapt to unfavourable environmental conditions. Shade avoidance by organ elongation is an important mechanism to move towards sunlight. A new mutant affected in auxin conjugation shows that auxin homeostasis controls hypocotyl elongation.

    • Jutta Ludwig-Müller
    Nature Plants 2, 16044
  • News and Views |

    Causal signals for seed initiation have been sought ever since double fertilization was discovered in 1898. New research reveals that auxin is an early driver of endosperm proliferation in Arabidopsis central cells, with or without fertilization.

    • Anna Koltunow
    •  & David S. Rabiger
    Nature Plants 1, 15189