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.

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  • News & Views |

    Regulation of organ growth involves multiple pathways that coordinate cell number and size in a process that is highly dependent on nutrient supply and energy levels. The simplicity of the Arabidopsis root tip provides a suitable model for the genetic dissection of plant organ growth regulation.

    • José-Manuel Pérez-Pérez
    Nature Plants 8, 729-730
  • News & Views |

    Auxin is a master hormone that affects most aspects of plant development. Its inactivation is a key process in regulating auxin levels, but it is only now that we are starting to properly understand the steps involved.

    • John J. Ross
    •  & Ariane Gélinas-Marion
    Nature Plants 7, 1546-1547
  • 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