FE, a phloem-specific Myb-related protein, promotes flowering through transcriptional activation of FLOWERING LOCUS T and FLOWERING LOCUS T INTERACTING PROTEIN 1

Mitsutomo Abe, Hidetaka Kaya, Ayako Watanabe-Taneda, Mio Shibuta, Ayako Yamaguchi, Tomoaki Sakamoto, Tetsuya Kurata, Israel Ausín, Takashi Araki, Carlos Alonso-Blanco

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    24 Citations (Scopus)

    Abstract

    In many flowering plants, the transition to flowering is primarily affected by seasonal changes in day length (photoperiod). An inductive photoperiod promotes flowering via synthesis of a floral stimulus, called florigen. In Arabidopsis thaliana, the FLOWERING LOCUS T (FT) protein is an essential component of florigen, which is synthesized in leaf phloem companion cells and is transported through phloem tissue to the shoot apical meristem where floral morphogenesis is initiated. However, the molecular mechanism involved in the long-distance transport of FT protein remains elusive. In this study, we characterized the classic Arabidopsis mutant fe, which is involved in the photoperiodic induction of flowering, and showed that FE encodes a phloem-specific Myb-related protein that was previously reported as ALTERED PHLOEM DEVELOPMENT. Phenotypic analyses of the fe mutant showed that FT expression is reduced in leaf phloem companion cells. In addition, the transport of FT protein from leaves to the shoot apex is impaired in the fe mutant. Expression analyses further demonstrated that FE is also required for transcriptional activation of FLOWERING LOCUS T INTERACTING PROTEIN 1 (FTIP1), an essential regulator for selective trafficking of the FT protein from companion cells to sieve elements. These findings indicate that FE plays a dual role in the photoperiodic induction of flowering: as a transcriptional activator of FT on the one hand, and its transport machinery component, FTIP1, on the other hand. Thus, FE is likely to play a role in regulating FT by coordinating FT synthesis and FT transport in phloem companion cells.

    Original languageEnglish
    Pages (from-to)1059-1068
    Number of pages10
    JournalPlant Journal
    Volume83
    Issue number6
    DOIs
    Publication statusPublished - 2015 Sep 1

    Keywords

    • Arabidopsis thaliana
    • FLOWERING LOCUS T
    • Myb-related protein
    • florigen
    • flowering
    • long-distance transport

    ASJC Scopus subject areas

    • Genetics
    • Plant Science
    • Cell Biology

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    Abe, M., Kaya, H., Watanabe-Taneda, A., Shibuta, M., Yamaguchi, A., Sakamoto, T., Kurata, T., Ausín, I., Araki, T., & Alonso-Blanco, C. (2015). FE, a phloem-specific Myb-related protein, promotes flowering through transcriptional activation of FLOWERING LOCUS T and FLOWERING LOCUS T INTERACTING PROTEIN 1. Plant Journal, 83(6), 1059-1068. https://doi.org/10.1111/tpj.12951