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.
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Korbei, B., Luschnig, C. Plants on (brassino)steroids. Nat. Plants 7, 548–549 (2021). https://doi.org/10.1038/s41477-021-00918-w
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DOI: https://doi.org/10.1038/s41477-021-00918-w