Phloem transport of the receptor DWARF14 protein is required for full function of strigolactones

Hiromu Kameoka, Elizabeth A. Dun, Mauricio Lopez-Obando, Philip B. Brewer, Alexandre de Saint Germain, Catherine Rameau, Christine A. Beveridge, Junko Kyozuka

    Research output: Contribution to journalArticlepeer-review

    24 Citations (Scopus)


    The cell-to-cell transport of signaling molecules is essential for multicellular organisms to coordinate the action of their cells. Recent studies identified DWARF14 (D14) as a receptor of strigolactones (SLs), molecules that act as plant hormones and inhibit shoot branching. Here, we demonstrate that RAMOSUS3, a pea ortholog of D14, works as a graft-transmissible signal to suppress shoot branching. In addition, we show that D14 protein is contained in phloem sap and transported through the phloem to axillary buds in rice. SLs are not required for the transport of D14 protein. Disruption of D14 transport weakens the suppression of axillary bud outgrowth of rice. Taken together, we conclude that the D14 protein works as an intercellular signaling molecule to fine-tune SL function. Our findings provide evidence that the intercellular transport of a receptor can regulate the action of plant hormones.

    Original languageEnglish
    Pages (from-to)1844-1852
    Number of pages9
    JournalPlant physiology
    Issue number3
    Publication statusPublished - 2016 Nov

    ASJC Scopus subject areas

    • Physiology
    • Genetics
    • Plant Science


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