Contribution of gibberellin deactivation by AtGA2ox2 to the suppression of germination of dark-imbibed Arabidopsis thaliana seeds

Yukika Yamauchi, Noriko Takeda-Kamiya, Atsushi Hanada, Mikihiro Ogawa, Ayuko Kuwahara, Mitsunori Seo, Yuji Kamiya, Shinjiro Yamaguchi

    Research output: Contribution to journalArticlepeer-review

    76 Citations (Scopus)

    Abstract

    Gibberellin levels in imbibed Arabidopsis thaliana seeds are regulated by light via phytochrome, presumably through regulation of gibberellin biosynthesis genes, AtGA3ox1 and AtGA3ox2, and a deactivation gene, AtGA2ox2. Here, we show that a loss-of-function ga2ox2 mutation causes an increase in GA4 levels and partly suppresses the germination inability during dark imbibition after inactivation of phytochrome. Experiments using 2,2-dimethylGA4, a GA4 analog resistant to gibberellin 2-oxidase, in combination with ga2ox2 mutant seeds suggest that the efficiency of deactivation of exogenous GA4 by AtGA2ox2 is dependent on light conditions, which partly explains phytochrome-mediated changes in gibberellin effectiveness (sensitivity) found in previous studies.

    Original languageEnglish
    Pages (from-to)555-561
    Number of pages7
    JournalPlant and Cell Physiology
    Volume48
    Issue number3
    DOIs
    Publication statusPublished - 2007 Mar

    Keywords

    • Arabidopsis thaliana
    • AtGA2ox2
    • Gibberellin
    • Gibberellin 2-oxidase
    • Phytochrome
    • Seed germination

    ASJC Scopus subject areas

    • Physiology
    • Plant Science
    • Cell Biology

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