Auxin

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 & Views |

    A study of a synthetic auxin response circuit in a heterologous system suggests that hindrance of Mediator complex function by the co-repressor TOPLESS may represent a form of promoter pausing, a mechanism that has not been described in plants before.

    • Nicholas Morffy
    •  & Lucia C. Strader
    Nature Plants 7, 862-863
  • News & Views |

    Long-distance transport is central to the mode of action of plant growth regulators. But in the case of brassinosteroids, spatiotemporal control of biosynthesis and local movements of the bioactive molecule or its precursors result in local hormone accumulation, functioning as a positional cue in root morphogenesis.

    • Barbara Korbei
    •  & Christian Luschnig
    Nature Plants 7, 548-549
  • News & Views |

    In a feat of protein engineering alchemy, a FRET biosensor for tryptophan has been engineered into a direct biosensor for auxin, after a determined journey of over 2,800 steps to switch to a sensitivity appropriate for a plant hormone.

    • Martin Balcerowicz
    • , Kartika N. Shetty
    •  & Alexander M. Jones
    Nature Plants 7, 546-547
  • News & Views |

    Plant roots have to orchestrate their growth pattern to access available nutrients. Root architecture is governed by auxin that locally steers growth and development of lateral roots, thereby increasing the uptake capacity. A new mechanism for ammonium acquisition by influencing cellular auxin import has been defined.

    • Hans Motte
    •  & Tom Beeckman
    Nature Plants 6, 1080-1081
  • News & Views |

    Genetic redundancy is a problem when studying auxin in flowering plants. The minimal auxin response system in the liverwort Marchantia polymorpha allows a detailed and thorough probing of the specificity of auxin response factors in planta.

    • C. S. Bascom Jr.
    •  & M. Estelle
    Nature Plants 6, 440-441