Plant hormones

Plant hormones, also known as phytohormones, are chemicals that regulate plant cell processes. They are signal molecules produced within the plant functioning in extremely low concentrations.

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  • News and Views |

    A previously unknown biologically active gibberellin present in seeds of Arabidopsis thaliana is formed by hydration of the gibberellin precursor GA12 through the action of GAS2, a 2-oxoglutarate-dependent dioxygenase that decreases sensitivity to abscisic acid and promotes seed germination and seedling establishment.

    • Peter Hedden
    Nature Plants 5, 459-460
  • News and Views |

    In autogamous plants, self-pollination is ensured by a timely opening of anthers (dehiscence) and release of mature pollen grains. Auxin plays a paramount role in controlling the correct timing of anther dehiscence. Now, a molecular switch that allows the timely change in auxin level in rice anthers has been unveiled.

    • Maura Cardarelli
    •  & Paolo Costantino
    Nature Plants 4, 408-409
  • 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 |

    Plants cannot escape from their enemies so they must rely on innate defences to fight off pests and pathogens. Salicylic acid (SA) is a plant hormone that regulates immunity. A new model for perception of the SA signal has been proposed, and could be of paramount importance in developing effective crop protection strategies.

    • Kemal Kazan
    Nature Plants 4, 327-328